The sinner is not only to forsake his thoughts, but also his way (actions). It is more than an intellectual acknowledgment that he has sinned. He must turn from those sins—he must confess and forsake them (see Prov. 28:13). In doing so, he will be abundantly pardoned. Repentance is not a “work,” as some would say. It is God-given to sinners, as is faith. See Acts 5:31; 11:18.
Isaiah 55:7 Let the wicked forsake his way, And the unrighteous man this thoughts; Let him return to the Lord, And He will have mercy on him; And to our God, For He will abundantly pardon.