text: What then is good? The knowledge of things. What is evil? The lack of knowledge of things. Your wise man, who is also a craftsman, will reject or choose in each case as it suits the occasion; but he does not fear that which he rejects, nor does he admire that which he chooses, if only he has a stout and unconquerable soul. I forbid you to be cast down or depressed. It is not enough if you do not shrink from work; ask for it. "But," you say, "is not trifling and superfluous work, and work that has been inspired by ignoble causes, a bad sort of work?" No; no more than that which is expended upon noble endeavours, since the very quality that endures toil and rouses itself to hard and uphill effort, is of the spirit, which says: "Why do you grow slack? It is not the part of a man to fear sweat." And besides this, in order that virtue may be perfect, there should be an even temperament and a scheme of life that is consistent with itself throughout; and this result cannot be attained without knowledge of things, and without the art which enables us to understand things human and things divine. That is the greatest good. If you seize this good, you begin to be the associate of the gods, and not their suppliant.