Theophilus to Autolycus

For it was fit that they who wrote should themselves have been eye-witnesses of those things concerning which they made assertions, or should accurately have ascertained them from those who had seen them; for they who write of things unascertained beat the air. For what did it profit Homer to have composed the Trojan war, and to have deceived many; or Hesiod, the register of the theogony of those whom he calls gods; or Orpheus, the three hundred and sixty-five gods, whom in the end of his life he rejects, maintaining in his precepts that there is one God?

What profit did the sphærography of the world's circle confer on Aratus, or those who held the same doctrine as he, except glory among men? And not even that did they reap as they deserved. And what truth did they utter? Or what good did their tragedies do to Euripides and Sophocles, or the other tragedians? Or their comedies to Menander and Aristophanes, and the other comedians? Or their histories to Herodotus and Thucydides? Or the shrines and the pillars of Hercules to Pythagoras, or the Cynic philosophy to Diogenes?

What good did it do Epicurus to maintain that there is no providence; or Empedocles to teach atheism; or Socrates to swear by the dog, and the goose, and the plane-tree, and Æsculapius struck by lightning, and the demons whom he invoked? And why did he willingly die? What reward, or of what kind, did he expect to receive after death? What did Plato's system of culture profit him? Or what benefit did the rest of the philosophers derive from their doctrines, not to enumerate the whole of them, since they are numerous? But these things we say, for the purpose of exhibiting their useless and godless opinions.