'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.

But the goal of our instruction is love [which springs] from a pure heart and a good conscience and a sincere faith.

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].