To commit sin is to willfully disobey God's commandments or to fail to act righteously despite a knowledge of the truth (see James 4:17).
The Lord has said that He “cannot look upon sin with the least degree of allowance” (D&C 1:31). Sin results in the withdrawal of the Holy Ghost. It makes the one who sins unable to dwell in the presence of Heavenly Father, for “no unclean thing can dwell with God” (1 Nephi 10:21).
Other than Jesus Christ, each person who has ever lived on earth has broken commandments or failed to act according to knowledge of the truth. The Apostle John taught: “If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, [Jesus Christ] is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness” (1 John 1:8-9). Through the Atonement of Jesus Christ, each person can repent and be forgiven of these sins.
—See True to the Faith (2004), 163-64
The promise of the Lord is that He will cleanse our garments with His blood. … He can redeem us from our personal fall.
Our loving Heavenly Father, … knowing that you and I would all sin and become unclean, provided a cleansing process from sin that … actually does work.
King Benjamin taught three basic principles that can help us retain a remission of our sins: “first, to remain humble; second, to call upon the Lord daily; and third, to stand steadfast in the faith.”
The scriptures teach repentance from sins and the correction of mistakes.
From a fireside address given at Brigham Young University, 5 August 1990.
An edited version of “God Will Forgive,” The Miracle of Forgiveness, Salt Lake City: Bookcraft, 1969, pp. 339–60.