'Hearts' in the Bible

And he shall go before him in the spirit and power of Elias, to turn hearts of fathers to children, and disobedient ones to the thoughts of just men, to make ready for the Lord a prepared people.

(and even a sword shall go through thine own soul;) so that the thoughts may be revealed from many hearts.

But as the people were in expectation, and all were reasoning in their hearts concerning John whether he might be the Christ,

But Jesus, knowing their reasonings, answering said to them, Why reason ye in your hearts?

And he said to them, Ye are they who justify themselves before men, but God knows your hearts; for what amongst men is highly thought of is an abomination before God.

Settle therefore in your hearts not to meditate beforehand your defence,

But take heed to yourselves lest possibly your hearts be laden with surfeiting and drinking and cares of life, and that day come upon you suddenly unawares;

And he said to them, Why are ye troubled? and why are thoughts rising in your hearts?