'Heart' in the Bible

On the seventh day, when the heart of the king was merry with wine, he commanded Mehuman, Biztha, Harbona, Bigtha, and Abagtha, Zethar, and Carcas, the seven chamberlains that ministered in the presence of Ahasuerus the king,

Then went Haman forth that day joyful and glad of heart: but when Haman saw Mordecai in the king's gate, that he stood not up nor moved for him, he was filled with wrath against Mordecai.

So Haman came in. And the king said unto him, What shall be done unto the man whom the king delighteth to honor? Now Haman said in his heart, To whom would the king delight to do honor more than to myself?

Then spake the king Ahasuerus and said unto Esther the queen, Who is he, and where is he, that durst presume in his heart to do so?