4 Bible Verses about Changed Heart

Therefore, if any one is in Christ, he is a new creation; the old things have passed away; behold, all things have become new.

but he is a Jew who is one inwardly; and circumcision is of the heart, spiritual, not literal, whose praise is not of men, but of God.

For sorrow before God worketh repentance to salvation never to be regretted; but the sorrow of the world worketh death.

and be not conformed to the fashion of this world, but be transformed by the renewal of your mind, that ye may learn by experience what is the will of God, what is good, and wellpleasing, and perfect.