'Heart' in the Bible

Won't they instruct you, and tell you, and bring out words from the heart?

He is wise in heart and strong in will who can be stubborn against him and succeed?

But you've hidden these things in your heart I know this was your purpose:

"Now for you, if you will prepare your heart, spread out your hands to him.

Accept what he has to teach you, and treasure his words in your heart.

If I have stepped away from the way, or if my heart covets whatever my eyes see, or if some other blemish clings to my hands,

"If my heart has been seduced by a woman and I've laid in wait at my friend's door,

if he hadn't thanked me from the bottom of his heart, if he had not been warmed by wool from my sheep,

so that in the depths of my deceived heart I worshipped them with my mouth and hands,

I speak from the innocence of my heart; and my lips will utter what I sincerely know.

"Indeed God is mighty and he doesn't show disrespect; he is mighty and strong of heart.

The godless at heart cherish anger; they won't cry out for help when God afflicts them.

"Now I'll conclude with this: my heart is trembling violently; it feels like it's about to leap from my body!

His heart is as strong as stone, it is as hard as a lower millstone.