Deism (/ˈdiːɪzəm/ DEE-iz-əm  or /ˈdeɪ.ɪzəm/ DAY-iz-əm; derived from Latin "deus" meaning "god") is the philosophical position that rejects revelation as a source of religious knowledge and asserts that reason and observation of the natural world are sufficient to establish the existence of a Supreme Being or creator of the universe. Deism as a distinct intellectual movement declined toward the end of the 18th century. Some of its tenets continued to live on as part of other intellectual movements, like Unitarianism, and it continues to have advocates today.