According to the writers of the New Testament, repentance is an essential step in our reconciliation with God. John the Baptist preached repentance and baptized those that had repented (Matthew 3:8, 11; Mark 1:4; Luke 3:3, 8). Peter preached repentance (Acts 2:38) and Paul implied that it is essential to our relationship with God. “For godly grief produces a repentance that leads to salvation without regret, whereas worldly grief produces death” (2 Corinthians 7:10, ESV). Perhaps most importantly, Jesus proclaimed that repentance is essential to our relationship with God. “No, I tell you; but unless you repent, you will all likewise perish” (Luke 13:5, ESV).
The importance of repentance then is that it is an essential step toward reconciliation with God and part of the process of accepting Jesus Christ as Lord of our lives. But when we repent and accept Jesus, it is strictly through the grace of God. “For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast” (Ephesians 2:8-9, ESV).