Deism is a philosophical belief that posits that God exists as an uncaused First Cause ultimately responsible for the creation of the universe, but does not interfere directly with the created world. Equivalently, deism can also be defined as the view which posits God's existence as the cause of all things, and admits its perfection but rejects divine revelation or direct intervention of God in the universe by miracles. It also rejects revelation as a source of religious knowledge and asserts that reason and observation of the natural world are sufficient to determine the existence of a single creator or absolute principle of the universe.