'Hearts' in the Bible

For although they knew God, they neither glorified him as God nor gave thanks to him. Instead, their thoughts turned to worthless things, and their senseless hearts were darkened.

For this reason, God delivered them to sexual impurity as they followed the lusts of their hearts and dishonored their bodies with one another.

They show that what the Law requires is written in their hearts, a fact to which their own consciences testify, and their thoughts will either accuse or excuse them

Now this hope does not disappoint us, because God's love has been poured out into our hearts by the Holy Spirit, who has been given to us.

But thank God that, though you were once slaves of sin, you became obedient from your hearts to that form of teaching with which you were entrusted!

and the one who searches our hearts knows the mind of the Spirit, for the Spirit intercedes for the saints according to God's will.

because such people are not serving the Messiah our Lord, but their own desires. By their smooth talk and flattering words they deceive the hearts of the unsuspecting.