Short and interesting biography of Pythagoras, learned a lot.
"6. As to his knowledge, it is said that he learned the mathematical sciences from the Egyptians, Chaldeans and Phoenicians; for of' old the Egyptians excelled, in geometry, the Phoenicians in numbers and proportions, and the Chaldeans of astronomical theorems, divine rites, and worship of the Gods; other secrets concerning the course of life he received and learned from the Magi.
37. His utterances were of two kinds, plain or symbolical. His teaching was twofold: of his disciples some were called Students, and others Hearers. The Students learned the fuller and more exactly elaborate reasons of science, while the Hearers heard only the chief heads of learning, without more detailed explanations.
42. He had also another kind of symbol, such as, pass not over a balance; that is, Shun avarice. Poke not the fire with a sword, that is, we ought not to excite a man full of fire and anger with sharp language. Pluck not a crown, meant not to violate the laws, which are the crowns of cities. Eat not the heart, signified not to afflict ourselves with sorrows. Do not sit upon a [pack]-measure, meant, do not live ignobly. On starting a journey, do not turn back, meant, that this life should not be regretted, when near the bourne of death. Do not walk in the public way, meant, to avoid the opinions of the multitude, adopting those of the learned and the few. Receive not swallows into your house, meant, not to admit under the same roof garrulous and intemperate men. Help a man to take up a burden, but not to lay it down, meant, to encourage no one to be indolent, but to apply oneself to labor and virtue. Do not carry the images of the Gods in rings, signified that one should not at once to the vulgar reveal one's opinions about the Gods, or discourse about them. Offer libations to the Gods, just to the ears of the cup, meant, that we ought to worship and celebrate the Gods with music, for that penetrates through the ears. Do not eat those things that are unlawful, sexual or increase, beginning nor end, nor the first basis of all things.
53. This primary philosophy of the Pythagoreans finally died out first, because it was enigmatical, and then because their commentaries were written in Doric, which dialect itself is somewhat obscure, so that Doric teachings were not fully understood, and they became misapprehended, and finally spurious, and later, they who published them no longer were Pythagoreans. The Pythagoreans affirm that Plato, Aristotle, Speusippus, Aristoxenus and Xenocrates; appropriated the best of them, making but minor changes (to distract attention from this their theft), they later collected and delivered as characteristic Pythagorean doctrines whatever therein was most trivial, and vulgar, and whatever had been invented by envious and calumnious persons, to cast contempt on Pythagoreanism.
When died the Pythagoreans, with them also died their knowledge, which till then than they had kept secret, except for a few obscure things which were commonly repeated by those who did not understand them. Pythagoras himself left no book; but some little sparks of his philosophy, obscure and difficult, were preserved by the few who were preserved by being scattered, as were Lysis and Archippus.