No, I'm just curious that you would use a secondary source instead of a primary one.
Pythagoras's works were arcane, written in Doric, and burned in antiquity.
"Now, some people say that Pythagoras did not leave behind him a single book; but they talk foolishly; for Heraclitus, the natural philosopher, speaks plainly enough of him, saying, 'Pythagoras, the Son of Mnesarchus, was the most learned of all men in history; and having selected from these writings, he thus formed his own wisdom and extensive learning, and mischievous art.' And he speaks thus, because Pythagoras, in the beginning of his treatise on Natural Philosophy, writes in the following manner: 'By the air which I breathe, and by the water which I drink, I will not endure to be blamed on account of this discourse.'" -- Diogenes Laertius, historian, 3rd century
"... until the time of Philolaus, there were no doctrines of Pythagoras ever divulged; and he [Philolaus] was the first [Greek] person who published the three celebrated books which Plato wrote to have purchased for him for a hundred minae." -- Diogenes Laertius, historian, 3rd century
"There were however certain persons who were hostile to the Pythagoreans, and who rose against them. That stratagems were employed to destroy them ... is universally acknowledged. ... Those who were called Cylonians continued to plot against the Pythagoreans ... they set fire to Milo's residence, where were assembled all the Pythagoreans, holding a council of war. All were burnt, except two, Achippus and Lysis, who ecaped through their bodily vigor." -- Iamblichus, philosopher, 3rd century
"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)...." -- Porphyry, philosopher, 3rd century
"Pythagoras's friends then gathered together in the house of Milo the wrestler; and were all stoned and burned when Cylon's followers set the house on fire. Only two escaped, Archippus and Lysis, according to the account of Neanthes." -- Porphyry, philosopher, 3rd century
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