The Emperor Marcus was an eager disciple of Sextus the Boeotian philosopher, being often in his company and frequenting his house. Lucius, who had just come to Rome, asked the Emperor, whom he met on his way, where he was going to and on what errand, and Marcus answered, ' it is good even for an old man to learn; I am now on my way to Sextus the philosopher to learn what I do not yet know.' And Lucius, raising his hand to heaven, said, ' O Zeus, the king of the Romans in his old age takes up his tablets and goes to school.'