'Heart' in the Bible

the Lord regretted that He had made man on the earth, and He was grieved in His heart.

Abraham fell facedown. Then he laughed and said to himself, “Can a child be born to a hundred-year-old man? Can Sarah, a ninety-year-old woman, give birth?”

“Before I had finished praying silently, there was Rebekah coming with her jug on her shoulder, and she went down to the spring and drew water. So I said to her: Please let me have a drink.

Esau held a grudge against Jacob because of the blessing his father had given him. And Esau determined in his heart: “The days of mourning for my father are approaching; then I will kill my brother Jacob.”