For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and deity; so that they are without excuse:
All Commentaries on Romans 1:20 Go To Romans 1
Augustine of Hippo
AD 430
How does Paul mean that they are without excuse, except by reference to a kind of excuse that usually prompts human pride to voice such protestations as: “If only I had known, I would not have done it.” … This kind of excuse is taken away from them when a precept is given or when the knowledge of how to avoid sin is made clear to them.