Repentance

"Faith in Jesus Christ naturally leads to repentance. There has been the need for repentance in the world from the time of Adam to the present day. The Lord instructed Adam, “Wherefore teach it unto your children, that all men, everywhere, must repent, or they can in nowise inherit the kingdom of God, for no unclean thing can dwell there, or dwell in his presence” (Moses 6:57).

We come to earth for the purpose of growing and progressing. This is a lifelong process. During this time we all sin (see Romans 3:23). We all have need to repent. Sometimes we sin because of ignorance, sometimes because of our weaknesses, and sometimes because of willful disobedience. In the Bible we read that “there is not a just man upon earth, that doeth good, and sinneth not” (Ecclesiastes 7:20) and that “if we say that we have no sin, we deceive ourselves, and the truth is not in us” (1 John 1:8).

What is sin? James said, “To him that knoweth to do good, and doeth it not, to him it is sin” (James 4:17). John described sin as “all unrighteousness” (1 John 5:17) and “the transgression of the law” (1 John 3:4).

That is why the Lord said, “All men, everywhere, must repent” (Moses 6:57). Except for Jesus Christ, who lived a perfect life, everyone who has lived upon the earth has sinned. Our Heavenly Father in His great love has provided us this opportunity to repent of our sins." - LDS.ORG

Scripture References:
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Mosiah 26:29 Therefore I say unto you, Go; and whosoever transgresseth against me, him shall ye judge according to the sins which he has committed; and if he confess his sins before thee and me, and repenteth in the sincerity of his heart, him shall ye forgive, and I will forgive him also.

3 Nephi 9:22 Therefore, whoso repenteth and cometh unto me as a little child, him will I receive, for of such is the kingdom of God. Behold, for such I have laid down my life, and have taken it up again; therefore repent, and come unto me ye ends of the earth, and be saved.

Moroni 6:8 But as oft as they repented and sought forgiveness, with real intent, they were forgiven.