Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. Tess Crowley, Deseret News
Christine Rappleye covered Elder Cook's ministry and the Tabernacle Choir and Orchestra's tour in Buenos Aires, Argentina.
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BUENOS AIRES, Argentina — A hundred years ago, Elder Melvin J. Ballard, an early 20th-century apostle of The Church of Jesus Christ of Latter-day Saints, traveled to South America to preach the gospel and open missions.
Elder Ballard — sent by President Heber J. Grant, the Church president at the time — “knew that there might be little success at the beginning,” Elder Quentin L. Cook of the Quorum of the Twelve Apostles told missionaries from four missions in two meetings.
“It is the Lord who is hastening the work,” Elder Cook said, adding, “We are instruments in His hands.”
Elder Cook met with the Argentina Buenos Aires North and Argentina Buenos Aires East missions on Monday, Aug. 18, and the Argentina Buenos Aires South and Argentina Buenos Aires West missions on Saturday, Aug. 23.
Church leaders had long known of the need of sending missionaries to South America, said Elder Cook, who chairs the Church’s Missionary Executive Council.
Joseph Smith at a priesthood meeting in 1834 said: “You don’t comprehend it. … This Church will fill North and South America — it will fill the world.”
In December 1925, Elder Ballard offered a prayer in Buenos Aires dedicating South America for the preaching of the gospel. The following year, when Elder Ballard was again in Argentina, he used an analogy of an acorn growing slowly into an oak tree, Elder Cook said.
Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, left, shakes hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
Elder Ballard said: “The work of the Lord will grow slowly for a time here just as an oak grows slowly from an acorn. It will not shoot up in a day as does the sunflower that grows quickly and then dies. But thousands will join the Church here. It will be divided into more than one mission and will be one of the strongest in the Church.”
Elder Cook told the missionaries: “It has been just exactly like that. That acorn has become a mighty oak tree.”
About 4.1 million members of The Church of Jesus Christ of Latter-day Saints live in South America, said Elder Cook. In Argentina, there are more than 500,000 Church members, some 80 stakes, 500-plus wards, 14 missions and four operating temples.
Elder Cook, who was accompanied by his wife, Sister Mary Cook, ministered in Buenos Aires, Argentina, during the Tabernacle Choir and Orchestra at Temple Square’s “Songs of Hope” tour stop in the city Aug. 18-24. The tour stop celebrated 100 years of The Church of Jesus Christ of Latter-day Saints in South America.
Sister Cook led the missionaries in a rousing rendition of “Hark All Ye Nations.”
Sister Mary Cook, wife of Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, bottom left, leads the group of missionaries from the Argentina Buenos Aires North and East Missions in song at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
Elder Cook was invited in 2003 by President Gordon B. Hinckley, with then-Elder Russell M. Ballard of the Quorum of the Twelve Apostles, to bring forth “Preach My Gospel,” a guide for missionaries. President Hinckley had a few instructions for them, including that a chapter would have the doctrine “that is necessary for somebody to go forward and be baptized and converted in this church.”
Elder Cook recalled President Hinckley instructing them to make sure “missionaries could easily learn and understand it” so when the missionaries returned home, they could be leaders in the Church and in their homes.
Missionaries sing before Elder Quentin L. Cook of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints arrives at a mission conference for the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, left, and wife, Sister Mary Cook, right, shake hands with missionaries at a missionary conference at the Argentina Buenos Aires North and East Missions La Boca meetinghouse in Buenos Aires on Monday, Aug. 19, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, left, and wife, Sister Mary Cook, right, arrive at a missionary conference at the Argentina Buenos Aires North and East Missions La Boca meetinghouse in Buenos Aires on Monday, Aug. 19, 2025. | Tess Crowley, Deseret News
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Sister Agustina Perez, right, hugs Sister Celina Ruiz, left, after a conference for missionaries of The Church of Jesus Christ of Latter-day Saints in the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, speaks at a missionary conference for the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Sister Mary Cook, wife of Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, bottom left, leads the group of missionaries from the Argentina Buenos Aires North and East Missions in song at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Missionaries attend a mission conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, speaks at a missionary conference for the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Joaquin E. Costa, General Authority Seventy and president of the South America South Area, speaks at a missionary conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Sister Renée Costa, wife of Elder Joaquin E. Costa, General Authority Seventy and president of the South America South Area, speaks at missionary conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, center, and Sister Mary Cook, left, smile in a photo with missionaries during a mission conference for the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Missionaries hold copies of the Book of Mormon at a mission conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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President David A. Jackson, Argentina Buenos Aires North Mission president, speaks at a missionary conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Daughters of President David A. Jackson, Argentina Buenos Aires North Mission leader, Emery Jackson, 13, left, and Ella Jackson, 17, right, listen during a missionary conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Missionaries take notes during a conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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President Chris Doughty, Argentina Buenos Aires East Mission president, speaks at a missionary conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Sister Leslie Doughy, Argentina Buenos Aires East Mission leader, speaks at a missionary conference for the Argentina Buenos Aires North and East Missions of The Church of Jesus Christ of Latter-day Saints at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook of the Quorum of the Twelve Apostles arrives at a missionary conference at the Argentina Buenos Aires North and East Missions La Boca meetinghouse in Buenos Aires on Monday, Aug. 19, 2025. | Tess Crowley, Deseret News
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Missionaries sing before Elder Quentin L. Cook of the Quorum of the Twelve Apostles arrives at a mission conference for the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, shakes hands with missionaries at a mission conference for the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, shakes hands with missionaries at a missionary conference at the Argentina Buenos Aires North and East Missions La Boca meetinghouse in Buenos Aires on Monday, Aug. 19, 2025. | Tess Crowley, Deseret News
“We see this work going forward in a wonderful way, and we are grateful for that,” Elder Cook said.
Elder Cook told the missionaries in both meetings that he had met with President Russell M. Nelson prior to coming to Argentina. Elder Cook spoke of President Nelson’s love for the missionaries, and the Apostle shared his witness of having a living Prophet and President Nelson’s prophetic leadership.
Elder Cook also testified of the Savior’s Atonement and Resurrection.
“Because of the Atonement, all that is unfair about life is resolved,” he said.
Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, center, and Sister Mary Cook, left, smile in a photo with missionaries during a mission conference for the Argentina Buenos Aires North and East Missions at the La Boca meetinghouse in Buenos Aires, Argentina, on Monday, Aug. 18, 2025. | Tess Crowley, Deseret News
On Monday, Aug. 18, with the Buenos Aires North and East missions, the Cooks were accompanied by Elder Joaquin E. Costa, General Authority Seventy and president of the South America South Area, and his wife, Sister Renee Costa, who both spoke.
Missionaries shake hands with Elder Quentin L. Cook of the Quorum of the Twelve Apostles; Elder Alan R. Walker, General Authority Seventy; and others at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, right, and wife, Sister Mary Cook, left, arrive at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Sister Savannah Nay, center, and Sister Brynlee Ashjian, right, attend a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, center, shakes hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, center, shakes hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, right, and his wife, Sister Mary Cook, left, arrive at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Argentina Buenos Aires South Mission President Tim Fewkes, center, and his wife, Sister Karen Fewkes, right, shake hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Sister Mary Cook, wife of Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, leads missionaries in a song at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Sister Mary Cook, wife of Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, listens to her husband speak at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Alan R. Walker, General Authority Seventy for The Church of Jesus Christ of Latter-day Saints, center, shakes hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Sister Ines Marcela Sulé, wife of Elder Alan R. Walker, General Authority Seventy for The Church of Jesus Christ of Latter-day Saints, center, shakes hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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A missionary carries a set of scriptures with Mosiah 4:10 on it at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Alan R. Walker, General Authority Seventy for The Church of Jesus Christ of Latter-day Saints, speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Sister Ines Marcela Sulé, wife of Elder Alan R. Walker, General Authority Seventy for The Church of Jesus Christ of Latter-day Saints, speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Missionaries take notes at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Argentina Buenos Aires West Mission President Richard G. Holley speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, left, shakes hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Sister Karen Fewkes, wife of Argentina Buenos Aires South Mission President Tim Fewkes, speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Sister Brynlee Ashjian leads the music at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Argentina Buenos Aires West Mission President Richard G. Holley speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, speaks at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Missionaries listen to Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, speak at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Missionaries listen to Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, speak at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires on Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News
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Elder Quentin L. Cook, of the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, shakes hands with missionaries at a missionary conference for Argentina Buenos Aires South and West Missions at the Ramos Mejia Stake Center in Buenos Aires Saturday, Aug. 23, 2025. | Tess Crowley, Deseret News