"Crantor, another philosopher associated with the earliest days of Plato's Academy, conceived the human soul as formed out of the primary substance of all things, the Monad or One, and the Duad or the Two. Plutarch speaks at length of this philosopher, who like his master believed in souls being distributed in earthly bodies as an exile and punishment. Herakleides, though some critics do not believe him to have strictly adhered to Plato's primal philosophy, taught the same ethics. Zeller presents him to us imparting, like Hicetas and Ecphantus, the Pythagorean doctrine of the diurnal rotation of the earth and the immobility of the fixed stars, but adds that he was ignorant of the annual revolution of the earth around the sun, and of the heliocentric system. But we have good evidence that the latter system was taught in the Mysteries, and that Socrates died for atheism, i.e., for divulging this sacred knowledge."