I have already pointed out many passages where Paul shows that we need to keep the moral law, that sin can keep us out of heaven. Our Lord himself also makes this clear:
Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father in heaven. Many will say to me on that day, ‘Lord, Lord, did we not prophesy in your name? Did we not drive out demons in your name? Did we not do mighty deeds in your name? Then I will declare to them solemnly, ‘I never knew you. Depart from me, you evildoers.’ (Matt. 7:21-23)
Now someone approached him and said, “Teacher, what good must I do to gain eternal life?” He answered him, “Why do you ask me about the good? There is only One who is good. If you wish to enter into life, keep the commandments.” He asked him, “Which ones?” And Jesus replied, “ ‘You shall not kill; you shall not commit adultery; you shall not steal; you shall not bear false witness; honor your father and your mother’; and ‘you shall love your neighbor as yourself.’” (Matt. 19:16-19)Will you not listen to Jesus, too?
Paul 'showed' nothing.
Rome INTERPRETS it this way - keeping it's members in a state of fear of LOSING their salvation if they do NOT get regular and periodic absolution from their priest.