 Locke tells us that the law of nature is revealed by reason. Locke makes the point about the law that it commands what is best for us. If it did not, he says, the law would vanish for it would not be obeyed. It is in this sense that Locke means that reason reveals the law. If you reflect on what is best for yourself and others, given the goal of survival and our natural equality, you will come to this conclusion. (See the section on  the law of nature  in the entry on Locke’s Political Philosophy.)