. . . Jesus . . . was . . . forty days tempted of the devil. And in those days he did eat nothing; and when they were ended, he afterward hungered.
And the devil said unto him, If thou be the Son of God, command this stone that it be made bread.And Jesus answered him, saying, It is written, That man shall not live by bread alone, but by every word of God. - Luke 4:1-4.
"The greatest lesson ever taught with regard to fasting was taught by the Savior," then Presiding Bishop Victor L. Brown said during the October 1977 general conference.
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ThisT powerful example of living the law of the fast teach
esT some basic lessons. First, there needs to be a purpose associated with fasting. The Savior Himself used the fast to gain inner strength and spiritual power during a crucial part of his ministry. The law of the fast can likewise bless us in times of temptation and stress if we are willing to live it.
"When we fast, we must work in appropriate ways to do everything we can to accomplish the purpose of our fast."