Pacem in Terris §6

⁶ But the mischief is often caused by erroneous opinions. Many people think that the laws which govern man's relations with the State are the same as those which regulate the blind, elemental forces of the universe. But it is not so; the laws which govern men are quite different. The Father of the universe has inscribed them in man's nature, and that is where we must look for them; there and nowhere else.