4 Bible Verses about Changed Heart

So, then, if any man is in Christ, he is a new creature; the old things have passed away; behold, all things have become new.

but he is a Jew who is one inwardly; and circumcision is that of the heart, in the spirit, not in the letter, whose praise is not of men, but of God.

For godly sorrow works repentance not to be regretted, which leads to salvation: but the sorrow of the world works death.

And be not conformed to this age, but be transformed by the renewing of your mind, that you may learn what the will of God is the good, and the acceptable, and the perfect.