'Heart' in the Bible

But because of your stubbornness and your unrepentant heart, you are storing up wrath for yourselves in the day of wrath, when God's righteous judgment is revealed!

but someone is a Jew who is one inwardly, and circumcision is of the heart by the Spirit and not by the written code. This person's praise is not from people but from God.

But thanks be to God that though you were slaves to sin, you obeyed from the heart that pattern of teaching you were entrusted to,

I have great sorrow and unceasing anguish in my heart.

But the righteousness that is by faith says: "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 that we preach),

because if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved.

For with the heart one believes and thus has righteousness and with the mouth one confesses and thus has salvation.