The Apostle John asked the Lord if he, John, might remain on the earth beyond the normal span of life for no other purpose than to bring more souls unto God. In granting that wish, the Savior said that this was a greater work and a nobler desire, even than that of desiring to come into the presence of the Lord speedily. Like all prophets and apostles, the Prophet Joseph Smith understood the deep meaning of John's request when he said, "After all that has been said, our greatest and most important duty is to preach the gospel." I bear witness of that gospel and of Jesus Christ, who embodied it. I testify that the worth of souls is great in the sight of God and that saving those souls through the redeeming Atonement of His Beloved Son is at the very heart of His work and His glory.
Our Most Important Duty
(D&C 6:14-24) Elder Jeffrey R. Holland teaches about Our most important duty.