'Heart' in the Bible

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

And I arose in the night, I and some few men with me but I told no man what my God had put in my heart to do for Jerusalem and there was no beast with me, except the beast that I rode upon.

And I sent to 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, for registration by genealogy. And I found a genealogical register of those that had come up at the first, and I found written in it:

and foundest his heart faithful before thee, and madest the covenant with him to give the land of the Canaanites, the Hittites, the Amorites, and the Perizzites, and the Jebusites, and the Girgashites, to give it to his seed; and thou hast performed thy words, for thou art righteous.