"They relate of Diogenes of Sinope, when he began to be a philosopher, that the Athenians were celebrating a festival, and there were public banquets and shows and mutual festivities, and drinking and revelling all night, and he, coiled up in a corner of the market-place intending to sleep, fell into a train of thought likely seriously to turn him from his purpose and shake his resolution, for he reflected that he had adopted without any necessity a toilsome and unusual kind of life, and by his own fault sat there debarred of all the good things. At that moment, however, they say a mouse stole up and began to munch some of the crumbs of his barley-cake, and he plucked up his courage and said to himself, in a railing and chiding fashion, "What say you, Diogenes? Do your leavings give this mouse a sumptuous meal, while you, the gentleman, wail and lament because you are not getting drunk yonder and reclining on soft and luxurious couches?" Whenever such depressions of mind are not frequent, and the mind when they take place quickly recovers from them, after having put them to flight as it were, and when such annoyance and distraction is easily got rid of, then one may consider one's progress in virtue as a certainty."