'Heart' in the Bible

And the king said unto me, Why is thy countenance sad, seeing thou art not sick? this is nothing else but sorrow of heart. Then I was very sore afraid.

And I arose in the night, I and some few men with me; neither told I any man what my God put into my heart to do for Jerusalem; neither was there any beast with me, save the beast that I rode upon.

Then I sent unto him, saying, There are no such things done as thou sayest, but thou feignest them out of thine own heart.

And my God put into my heart to gather together the nobles, and the rulers, and the people, that they might be reckoned by genealogy. And I found the book of the genealogy of them that came up at the first, and I found written therein:

and foundest his heart faithful before thee, and madest a covenant with him to give the land of the Canaanite, the Hittite, the Amorite, and the Perizzite, and the Jebusite, and the Girgashite, to give it unto his seed, and hast performed thy words; for thou art righteous.