'Hearts' in the Bible

But there were some of the scribes sitting there, and reasoning in their hearts,

Immediately Jesus, perceiving in his spirit that they so reasoned within themselves, said to them, "Why do you reason these things in your hearts?

When he had looked around at them with anger, being grieved at the hardening of their hearts, he said to the man, "Stretch out your hand." He stretched it out, and his hand was restored as healthy as the other.

for they hadn't understood about the loaves, but their hearts were hardened.

For from within, out of the hearts of men, proceed evil thoughts, adulteries, sexual sins, murders, thefts,