Because the Aaronic Priesthood holds the keys of the preparatory gospel, Aaronic Priesthood holders have the responsibility to "invite all to come unto Christ" (D&C 20:59) by teaching the world of faith, repentance and remission of sins through baptism, just as John the Baptist prepared the way for the Savior in the lives of people in His time. Quorum instruction and activities should teach young men how to share the gospel with those around them and prepare them for full-time missions.
Aaronic Priesthood LeadershipHandbook, p. 7