Legatio Ad Gaium

And in reference to the case of Macro, they said, "The man was puffed up with pride in an immoderate degree; he had no idea of that great lesson which came from Delphi, 'know thyself.' And they say that knowledge is the cause of happiness, and that ignorance is the parent of unhappiness. What could have possessed him to make such an alteration and change in their relative positions as to thrust himself, who was a subject, into the rank of a governor, and to depress Caius, who was the emperor, into the place of a subject? For it is the part of a ruler to command, and that was what Macro did; but it is the duty of a subject to obey, and that was what he considered that Caius was to submit to."