This is a subsidiary post of Heart.
Romans 2:14, 15, 16 – Our thoughts can either accuse or defend us.
Romans 10:10 – With the heart we believe. Therefore, a human heart is the instrument – you could also say “organ” or “faculty” – of faith. It is the organ of our being through which we believe, through which we exercise faith.
Hebrews 3:12 – See note on Romans 10:10 above. As the heart is the organ through which we believe, it is for that very reason the organ through which we disbelieve as well.