I cannot approve of Heraclitus, who, being self-taught and arrogant, said, “I have explored myself.” Nor can I praise him for hiding his poem 424 in the temple of Artemis, in order that it might be published afterwards as a mystery; and those who take an interest in such things say that Euripides the tragic poet came there and read it, and, gradually learning it by heart, carefully handed down to posterity this darkness 425 of Heraclitus. Death, however, demonstrated the stupidity of this man; for, being attacked by dropsy, as he had studied the art of medicine as well as philosophy, he plastered himself with cow-dung, which, as it hardened, contracted the flesh of his whole body, so that he was pulled in pieces, and thus died. Then, one cannot listen to Zeno, who declares that at the conflagration the same man will rise again to perform the same actions as before; for instance, Anytus and Miletus to accuse, Busiris to murder his guests, and Hercules to repeat his labours; and in this doctrine of the conflagration he introduces more wicked than just persons—one Socrates and a Hercules, and a few more of the same class, but not many, for the bad will be found far more numerous than the good. And according to him the Deity will manifestly be the author of evil, dwelling in sewers and worms, and in the perpetrators of impiety. The eruptions of fire in Sicily, moreover, confute the empty boasting of Empedocles, in that, though he was no god, he falsely almost gave himself out for one. I laugh, too, at the old wife’s talk of Pherecydes, and the doctrine inherited from him by Pythagoras, and that of Plato, an imitation of his, though some think otherwise. And who would give his approval to the cynogamy of Crates, and not rather, repudiating the wild and tumid speech of those who resemble him, turn to the investigation of what truly deserves attention? Wherefore be not led away by the solemn assemblies of philosophers who are no philosophers, who dogmatize one against the other, though each one vents but the crude fancies of the moment. They have, moreover, many collisions among themselves; each one hates the other; they indulge in conflicting opinions, and their arrogance makes them eager for the highest places. It would better become them, moreover, not to pay court to kings unbidden, nor to flatter men at the head of affairs, but to wait till the great ones come to them.
He was called δ σκοτεινός for his obscurity.