'Heart' in the Bible

He answered them, “Isaiah prophesied correctly about you hypocrites, as it is written:These people honor Me with their lips,but their heart is far from Me.

For it doesn’t go into his heart but into the stomach and is eliminated.” (As a result, He made all foods clean.)

Aware of this, He said to them, “Why are you discussing that you do not have any bread? Don’t you understand or comprehend? Is your heart hardened?

I assure you: If anyone says to this mountain, ‘Be lifted up and thrown into the sea,’ and does not doubt in his heart, but believes that what he says will happen, it will be done for him.

Love the Lord your God with all your heart, with all your soul, with all your mind, and with all your strength.

And to love Him with all your heart, with all your understanding, and with all your strength, and to love your neighbor as yourself, is far more important than all the burnt offerings and sacrifices.”

Later, He appeared to the Eleven themselves as they were reclining at the table. He rebuked their unbelief and hardness of heart, because they did not believe those who saw Him after He had been resurrected.