John Locke (1632 – 1704) is one of the thinkers of Enlightenment philosophy. His moral views are a reflection of the natural understanding of religion formed by the Enlightenment philosophy. The purpose of natural religion is to build a religion that is separate from the traditional view and historical religious understanding. Advocates of this view necessarily base the existence of God and adopt a deist view. Locke advocated a similar idea, and because he was an empiricist thinker, he wanted to base his understanding of morality and God, which he emphasized in nature. He thinks there is a law in nature. This law of nature can be discovered with the light of nature, man can live ethically by reaching this law and reach the existence of God. But Locke cannot explain and obscure what he means here with the light of nature in his Essays on the Law of Nature. This natural light is sometimes an innate ability, sometimes mind, and sometimes sensory data. Sometimes he thinks of these three as complementary elements. After all, the combination of these three is known as the law of nature, and people have to comply with the moral principles that are necessarily caused by the knowledge of the law of nature. In this sense, Locke, who also restricts human liberty, reaches a deterministic understanding of morality, human and existence depending on nature. Emile Boutroux (d. 1921) criticized this determinist view.