'Repent' in the Bible

and saying, “The [appointed period of] time is fulfilled, and the kingdom of God is at hand; repent [change your inner self—your old way of thinking, regret past sins, live your life in a way that proves repentance; seek God’s purpose for your life] and believe [with a deep, abiding trust] in the good news [regarding salvation].”

So they went out and preached that men should repent [that is, think differently, recognize sin, turn away from it, and live changed lives].