'Heart' in the Bible

to Timothy, my true son in the faith: Grace, mercy, and peace [inner calm and spiritual well-being] from God the Father and Christ Jesus our Lord.

Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned:

Keeping the secret of the faith in a heart free from sin.

Have a care for these things; give yourself to them with all your heart, so that all may see how you go forward.

To the older women as to mothers, to the younger as to sisters, with a clean heart.

But as for you, O man of God, flee from these things; aim at and pursue righteousness [true goodness, moral conformity to the character of God], godliness [the fear of God], faith, love, steadfastness, and gentleness.

Instruct them to do good, to be rich in good works, to be generous, willing to share [with others].