And Jesus defined repentance for us. Jesus said the Ninevites will rise up in Judgment against this generation because they repented at the preaching of Jonah (Matthew 12:41). If you were to turn to Jonah 3:6-10, you would see that the King of the Ninevites told the people to:
(a) Cry out to God (i.e. Admit their sinful condition in a Godly way or confess their sin) and
(b) Turn away from their wicked ways (Forsake their sin)
God noticed that they turned from their evil or wickedness and God had then turned away from bringing judgment or wrath He was going to bring upon them originally. This truth is confirmed elsewhere in the Bible. Proverbs 28:13 says he that confesses and forsakes sin shall have mercy. 1 John 1:9 says if we confess our sins he is faithful and just to forgive us our sins. 1 John 1:7 says if we walk in the light as he is in the light, the blood of Jesus Christ cleanses us from all sin (Which is another way of saying a person is forsaking their sin because they are walking uprightly or walking in the light - Also see 1 John 2:3-6).
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