Luke 13:3: “I tell you, no, but unless you repent, you will all likewise perish.”
Acts 2:38: "Peter said to them, "Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit.”
Repentance, means to turn away from our old manner of life, the sinful manner in which we lived, to live a godly life. If we haven’t forsaken our old sinful ways, but continue to live in them, then we haven’t changed our heart. A man must walk according to the gospel in order to be pleasing to God.