'Hearts' in the Bible

And they made their hearts like the hardest stone, so that they might not give ear to the law and the words which the Lord of armies had said by the earlier prophets: and there came great wrath from the Lord of armies.

And Ephraim will be like a man of war, and their hearts will be glad as with wine; and their children will see it with joy; their hearts will be glad in the Lord.

And the families of Judah will say in their hearts, The people of Jerusalem have their strength in the Lord of armies, their God.