'Hearts' in the Bible

So get rid of all uncleanness and all that remains of wickedness, and with a humble spirit receive the word [of God] which is implanted [actually rooted in your heart], which is able to save your souls.

But if you have bitter jealousy and selfish ambition in your hearts, do not be arrogant, and [as a result] be in defiance of the truth.

You are jealous and covet [what others have] and your lust goes unfulfilled; so you murder. You are envious and cannot obtain [the object of your envy]; so you fight and battle. You do not have because you do not ask [it of God].

Come close to God [with a contrite heart] and He will come close to you. Wash your hands, you sinners; and purify your [unfaithful] hearts, you double-minded [people].

On the earth you have lived luxuriously and abandoned yourselves to soft living and led a life of wanton pleasure [self-indulgence, self-gratification]; you have fattened your hearts in a day of slaughter.

You too, be patient; strengthen your hearts [keep them energized and firmly committed to God], because the coming of the Lord is near.