3.23.1
First say to yourself Who you wish to be: then do accordingly what you are doing; for in nearly all other things we see this to be so. Those who follow athletic exercises first determine what they wish to be, then they do accordingly what follows. If a man is a runner in the long course, there is a certain kind of diet, of walking, rubbing, and exercise: if a man is a runner in the stadium, all these things are different; if he is a Pentathlete, they are still more different. So you will find it also in the arts. If you are a carpenter, you will have such and such things: if a worker in metal, such things. For every thing that we do, if we refer it to no end, we shall do it to no purpose; and if we refer it to the wrong end, we shall miss the mark. Further, there is a general end or purpose, and a particular purpose. First of all, we must act as a man. What is comprehended in this? We must not be like a sheep, though gentle; nor mischievous, like a wild beast. But the particular end has reference to each person's mode of life and his will. The lute-player acts as a lute-player, the carpenter as a carpenter, the philosopher as a philosopher, the rhetorician as a rhetorician. When then you say, Come and hear me read to you: take care first of all that you are not doing this without a purpose; then if you have discovered that you are doing this with reference to a purpose, consider if it is the right purpose. Do you wish to do good or to be praised? Immediately you hear him saying, To me what is the value of praise from the many? and he says well, for it is of no value to a musician, so far as he is a musician, nor to a geometrician. Do you then wish to be useful? in what? tell us that we may run to your audience room. Now can a man do anything useful to others, who has not received something useful himself? No, for neither can a man do any thing useful in the carpenter's art, unless he is a carpenter; nor in the shoemaker's art, unless he is a shoemaker.