'Heart' in the Bible

but as it is written, Things which eye saw not, and ear heard not, And which entered not into the heart of man, Whatsoever things God prepared for them that love him.

But he that standeth stedfast in his heart, having no necessity, but hath power as touching in his own heart, to keep his own virgin daughter , shall do well.

the secrets of his heart are made manifest; and so he will fall down on his face and worship God, declaring that God is among you indeed.