'Heart' in the Bible

He said to them, "Isaiah prophesied correctly about you hypocrites, as it is written: 'This people honors me with their lips, but their heart is far from me.

For it does not enter his heart but his stomach, and then goes out into the sewer." (This means all foods are clean.)

For from within, out of the human heart, come evil ideas, sexual immorality, theft, murder,

I tell you the truth, if someone 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 mind, and with all your strength and to love your neighbor as yourself is more important than all burnt offerings and sacrifices."

Then he appeared to the eleven themselves, while they were eating, and he rebuked them for their unbelief and hardness of heart, because they did not believe those who had seen him resurrected.