Monism is a theory or doctrine that denies the existence of a distinction or duality in some sphere, such as that between matter and mind or God and the world. Monism is typically a philosophical belief that all things in existence are part of a unified whole or essential oneness. Monists believe that all things, such as people, animals, and objects, are all connected and originated from the same source. This oneness is sometimes called God, nature, or the universe.