'Heart' in the Bible

For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened.

But because of your stubbornness and unrepentant heart you are storing up wrath for yourself in the day of wrath and revelation of the righteous judgment of God,

But he is a Jew who is one inwardly; and circumcision is that which is of the heart, by the Spirit, not by the letter; and his praise is not from men, but from God.

But thanks be to God that though you were slaves of sin, you became obedient from the heart to that form of teaching to which you were committed,

that I have great sorrow and unceasing grief in my heart.

But the righteousness based on faith speaks as follows: “Do not say in your heart, ‘Who will ascend into heaven?’ (that is, to bring Christ down),

But what does it say? “The word is near you, in your mouth and in your heart”—that is, the word of faith which we are preaching,

that if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved;

for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation.