Every person has a conscience which is designed to, not only tell them right and wrong, but to also point them to what nature is telling them in Romans 1, that there is a Creator who wants to know them.  This next question may prove difficult for you, if you do not take advantage of the picture and this practice setting.  Whom, in Romans 4, does Paul quote for describing the blessedness of a man that God considers righteous, covering his sin?