'Heart' in the Bible

because that, knowing God, they glorified him not as God, neither gave thanks; but became vain in their reasonings, and their senseless heart was darkened.

but after thy hardness and impenitent heart treasurest up for thyself wrath 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 of the heart, in the spirit not in the letter; whose praise is not of men, but of God.

But thanks be to God, that, whereas ye were servants of sin, ye became obedient from the heart to that form of teaching whereunto ye were delivered;

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

Brethren, my heart's desire and my supplication to God is for them, that they may be saved.

But the righteousness which is of faith saith thus, Say not in thy heart, Who shall ascend into heaven? (that is, to bring Christ down:)

But what saith it? The word is nigh thee, in thy mouth, and in thy heart: that is, the word of faith, which we preach:

because if thou shalt confess with thy mouth Jesus as Lord, and shalt believe in thy heart that God raised him from the dead, thou shalt be saved:

for with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.