'Heart' in the Bible

He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.

And supper being ended, the devil having now put into the heart of Judas Iscariot, Simon's son, to betray him;

Let not your heart be troubled: ye believe in God, believe also in me.

Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid.

But because I have said these things unto you, sorrow hath filled your heart.

And ye now therefore have sorrow: but I will see you again, and your heart shall rejoice, and your joy no man taketh from you.