4 Bible Verses about Changed Heart

Therefore, if any person is in [fellowship with] Christ, he is a new person. His old ways have passed away; now his ways have become new.

But the [true] Jew is the person who is one on the inside, and [his] circumcision is a heart condition, [produced] by the Holy Spirit and not by the written law of Moses. [Note: Some translate "Spirit" here as "spirit" and make it simply an amplification of "heart"]. This person receives his praise from God and not [merely] from people.

For the sorrow that God desires produces repentance [i.e., a change of heart and life] that leads to salvation, and which brings no regrets. But the sorrow of the world [i.e., sorrow for wrongdoing for reasons unrelated to God or moral principles] produces [spiritual] death.

And you people must not be conformed to [the values and standards of] this age, but you should become transformed [i.e., changed in attitude and action] by having your mind renewed [i.e., to think in a totally different way]. Then you will be able to determine [and practice] God's will, the thing that is good, and acceptable and perfect.