John 8:3-11 illustrates what God wants to see. Stated in a simple phrase, Jesus Christ says, "Go and sin no more."
Repentance means to quit sinning, and sinning is the breaking of God's spiritual law. Therefore, repentance means to begin living according to God's Commandments. God's Commandments are God's laws enforced by His government—His Kingdom. This means that we must be obedient to His laws, which are His will, instead of our own self-will.
Repentance is something begun and required by God before baptism, and it is something that we must do for the rest of our lives. Romans 3:23 tells us we are all sinners. And we know from experience that we have constant need of this attitude of repentance.