He had read Augustine's Confessions and believed it to be a fatalistic and pessimistic view of human nature. Pelagius' followers, including Caelestius, went further than their teacher and removed justification through faith, setting up the morality- and works-based salvation known as Pelagianism. It should be mentioned that the only historical evidence of the teachings of Pelagius or his followers is found through the writings of his two strongest opponents — Augustine and Jerome.