Justification and Sanctification
Doctrine and Covenants 20:30–31
30 And we know that justification through the grace of our Lord and Savior Jesus Christ is just and true;
31 And we know also, that sanctification through the grace of our Lord and Savior Jesus Christ is just and true, to all those who love and serve God with all their mights, minds, and strength.
Elder Bruce R. McConkie wrote:
“As with all other doctrines of salvation, justification is available because of the atoning sacrifice of Christ, but it becomes operative in the life of an individual only on conditions of personal righteousness. As Paul taught, men are not justified by the works of the Mosaic law alone any more than men are saved by those works alone. The grace of God, manifest through the infinite and eternal Atonement wrought by His Son, makes justification a living reality for those who seek righteousness (Isaiah 53:11; Mosiah 14:11).”
(Mormon Doctrine, 2nd ed. , 408.)