Hermann Samuel Reimarus, was a German philosopher and writer of the Enlightenment who is remembered for his Deism, the doctrine that human reason can arrive at a knowledge of God and ethics from a study of nature and our own internal reality, thus eliminating the need for religions based on revelation. He denied the supernatural origin of Christianity, and was the first influential critic to investigate the historical Jesus. According to Reimarus, Jesus was a mortal Jewish prophet, and the apostles founded Christianity as a religion separate from Jesus’ own ministry.