ISB ~ John 3 v36

believes … does not obey:Faith is exercised when we trust in God and entrust ourselves to God. Because it involves both the assent of the mind and the consent of the will, it can never be a purely intellectual decision that exists independently of one’s behavior (Jas 2:14-26). It is because faith and faithfulness are two sides of the same coin that the opposite of faith is not just unbelief, but disobedience (CCC 161).