Discourses: Book 4 8 : 3
But even those who are styled philosophers pursue their calling with means which are sometimes good and sometimes bad. For example, when they have taken a rough cloak and let their beards grow, they say, "I am a philosopher." But nobody will say, "I am a musician," if he buys a plectrum and a cithara; nor, "I am a smith," if he puts on a felt cap and an apron; but the guise is fitted to the art, and they get their name from the art, but not from the guise. That is why Euphrates was right when he used to say: "For a long time I tried not to let people know that I was a philosopher, and this," he says, "was useful to me. For, in the first place, I knew that whatever I did well, I did so, not on account of the spectators, but on my own account; it was for my own sake that I ate well, and kept my countenance and gait composed; it was all for myself and for God. And, secondly, as the contest was mine alone, so also I alone ran the risks; in no respect through me, if I did what was disgraceful or unseemly, did the cause of philosophy come into danger, nor did I do harm to the multitude by going wrong as a philosopher. For that reason those who were ignorant of my purpose wondered how it was that, although I was familiar with all the philosophers and lived with them, I was myself not acting in the role of a philosopher. And what harm was there in having the philosopher that I was, recognized by what I did, rather than by the outward signs?"