Heber J. Grant on Missionary Work

We as a people have one supreme thing to do, and this is to call upon the world to repent of sin, to come to God. And it is our duty above all others to go forth and proclaim the gospel of the Lord Jesus Christ, the restoration again to the earth of the plan of life and salvation . . . We have in very deed the pearl of great price. We have that which is of more value than all the wealth and the scientific information which the world possesses. We have the plan of life and salvation . . . The best way in the world to show our love for our neighbor is to go forth and proclaim the gospel of the Lord Jesus Christ of which he has given us an absolute knowledge concerning its divinity.
CR Apr, 1927,  175-76

Joseph F. Smith on Missionary Work

We have a mission in the world: each man, each woman, each child who has grown to understanding or to the years of accountability, ought . . . to be qualified to preach the truth, to bear testimony of the truth.
Gospel Doctrine, 251-52