Moreover, that they did not decline foreign friendships carelessly, but that they avoided and guarded against them, with the greatest sedulity; and also, that they rigidly preserved friendship towards each other for many ages, may be inferred from what Aristoxenus in his treatise On the Pythagoric life, says he heard from Dionysius, the tyrant of Sicily, when having fallen from monarchy he taught grammar at Corinth. For Aristoxenus says as follows: “These men as much as possible prohibited lamentations and tears, and every thing of this kind; and in a similar manner adulation, entreaty, supplication, and the like. Dionysius, therefore, having fallen from his tyranny and come to Corinth, narrated to us the particulars concerning Phintias and Damon the Pythagoreans; and these were respecting the one being sponsor for the death of the other. But the mode of the suretyship was as follows: He said that certain persons, who were familiar with him, had frequently made mention of the Pythagoreans, defaming and reviling them, calling them arrogant, and asserting that their gravity, their pretended fidelity, and apathy would be laid aside, if any one should cause them to fall into [some great] calamity. Certain persons however contradicting this, and contention arising on the subject, recourse was had to artifice, and one of the accusers of Phintias said before him, that he evidently conspired with certain others against the life of Dionysius. This also was testified by some that were present, and the charges against Phintias appeared to be very probable. Phintias therefore was astonished at the accusation. But when Dionysius had unequivocally said, that he had accurately explored all these particulars, and that it was necessary that he should die, Phintias replied, that if it appeared requisite to him that this should take place, he requested that he would grant him the remainder of the day, in order that he might settle his own affairs, and also those of Damon. For those men lived together, and had all things in common. Phintias, however, being the elder, the management of the domestic concerns was for the most part undertaken by him. He requested therefore, that Dionysius would suffer him to depart for this purpose, and he would appoint Damon for his surety. Dionysius therefore said that he wondered at the request, and that he asked him whether there was any man who was willing to become security for the death of another. But Phintias asserting that there was, Damon was sent for, who, on hearing what had happened, said that he would become the sponsor, and that he would remain there till Phintias returned. Dionysius therefore said, that he was immediately astonished at these circumstances; but that they who at first introduced the experiment, derided Damon as one who would be caught, and said sneeringly that he would be the vicarious stag. When therefore it was near sunset, Phintias came to die; at which all that were present were astonished and subdued. But Dionysius said, that having embraced and kissed the men, he requested that they would receive him as the third into their friendship. They however would by no means consent to a thing of this kind, though he entreated them to comply with his request.” And these things are related by Aristoxenus, who received them from Dionysius himself.

Pythagoras taught that friendship was the truest and nearest perfect of all relationships. He declared that in Nature there was a friendship of all...

For Alcmaeon of Crotona having said, "It is easier to guard against a man who is an enemy than a friend," Sophocles wrote in the Antigone: "For what s...