'Heart' in the Bible

So it is right for me to take thought for you all in this way, because I have you in my heart; for in my chains, and in my arguments before the judges in support of the good news, making clear that it is true, you all have your part with me in grace.

And most of the brothers in the Lord, taking heart because of my chains, are all the stronger to give the word of God without fear.

Though some are preaching Christ out of envy and competition, others do it out of a good heart:

Because his heart was with you all, and he was greatly troubled because you had news that he was ill: