There will be a Judgment Day. There will be a time of accounting for our deeds in mortality. Let us carefully consider our eventual position before the judgment bar of God and regulate our lives according to eternal principles. Marion G. Romney comments on this doctrine:
Alma implies here that the “exercise of faith in the redemption” of Christ [verse 15] sufficient to bring about the mighty change in one’s heart is prerequisite to obtaining a pure heart and clean hands. He also implies that if on the great judgment day one can look up to God with a pure heart and clean hands, he will hear the voice of the Lord saying unto him, “Come unto me ye blessed” [verse 16]; if he cannot do so, his soul will be filled with guilt and remorse. (Learning for the Eternities [Salt Lake City: Deseret Book, 1977], 127)