  The last major item in Berkeley’s ontology is God, himself a spirit, but an infinite one. Berkeley believes that once he has established idealism, he has a novel and convincing argument for God’s existence as the cause of our sensory ideas. He argues by elimination: What could cause my sensory ideas?  Candidate causes, supposing that Berkeley has already established that matter doesn’t exist, are (1) other ideas, (2) myself, or (3) some other spirit. Berkeley eliminates the first option with the following argument (PHK 25):