God commands all people everywhere to repent (Acts 17:30). Charles Spurgeon explained, "To repent is to change your mind about sin and Christ and all the great things of God." He went on to say, "The person who truly repents is never satisfied with his or her repentance. We can no more repent perfectly than we can live perfectly."
We must repent to have a change of mind about sin and Christ. We must repent as sinners who have fallen short of the glory of God (Romans 3:23). We know that only the Lord Jesus Christ can save us from the curse of sin and the power of sin. We repent to turn from the sin of unbelief to believe on the Lord Jesus Christ (Acts 16:31).
Christians are not perfect people in this life. We are still tempted and sin from time to time. Therefore, we must repent and confess our sins to God. Then, we find fresh cleansing from our sins, through the blood of Jesus Christ (1 John 1:9).
To repent is to have a change of mind. As we grow in the grace and knowledge of our Lord Jesus Christ through Bible study, we are changed by receiving more truth from the word of God. We must be willing to repent, because none of us live perfect lives (1 John 1:8). That's why Spurgeon said, "We can no more repent perfectly than we can live perfectly."