'Heart' in the Bible

But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.

Nevertheless he that standeth stedfast in his heart, having no necessity, but hath power over his own will, and hath so decreed in his heart that he will keep his virgin, doeth well.

And thus are the secrets of his heart made manifest; and so falling down on his face he will worship God, and report that God is in you of a truth.