'Hearts' in the Bible

Then, with the eyes of your hearts enlightened, you will know the confidence that is produced by God having called you, the rich glory that is his inheritance among the saints,

and that the Messiah would make his home in your hearts through faith. Then, having been rooted and grounded in love,

Then you will recite to one another psalms, hymns, and spiritual songs; you will sing and make music to the Lord with your hearts;

I am sending him to you for this very reason, so that you may know how we are doing and that he may encourage your hearts.