A dozen centuries ahead of his time, he rejects astrology in favour of environment and heredity as explaining human traits. From The City of God : 'Cicero says that the famous physician Hippocrates has left in writing that he had suspected that a certain pair of brothers were twins, from the fact that they both took ill at once, and their disease advanced to its crisis and subsided in the same time in each of them. 3 Posidonius the Stoic, who was much given to astrology, used to explain the fact by supposing that they had been born and conceived under the same constellation. In this question the conjecture of the physician is by far more worthy to be accepted, and approaches much nearer to credibility, since, according as the parents were affected in body at the time of copulation, so might the first elements of the fætuses have been affected, so that all that was necessary for their growth and development up till birth having been supplied from the body of the same mother, they m...