When he was 17 he enrolled at Plato’s Academy in Athens, where he spent the next 20 years as first a student then a teacher.
Alipokuwa na umri wa miaka 17 alijiandikisha katika Chuo cha Plato huko Athene, ambako alitumia miaka 20 iliyofuata kama mwanafunzi kwanza kisha mwalimu.