Let us observe an important point. In China where filial piety is regarded as the root of all virtues and the first source of instruction,[286] the exercise of the duties which it imposes admits of no exception. As the legislator teaches there that the greatest crime is to lack in filial piety, he infers that he who has been a good son will be a good father and that thus nothing will break the social tie[287]; for he first establishes this virtue which embraces all, from the emperor to the lowliest of his subjects, and that it is for the peoples what the regularity of the celestial movements is for the ethereal space: but in Italy and in Greece where Pythagoras established his dogmas, it would have been dangerous for him to give the same extension, since this virtue not being that of the State, would necessarily involve abuses in the paternal authority, already excessive among certain peoples. That is the reason the disciples of this philosopher, in distinguishing between forced and voluntary actions, judged wisely that it would be necessary to apply here the distinction: therefore they urged to honour one’s father and mother and to obey them in all that concerns the body and mundane things, but without abandoning one’s soul to them[288]; for the divine law declares free what has not been received from them and delivers it from their power. Pythagoras furthermore had favoured this opinion by saying, that after having chosen a friend from among the men most commended for their virtues, it was necessary to learn by his actions and to be guided by his discourse: which testified to the lofty idea that he had of friendship. “Friends,” he said, “are like companions of travel who reciprocally assist each other to persevere in the path of the noblest life.[289]” It is to him that we owe that beautiful expression, so often quoted, so little felt by the generality of men, and which a victorious king, Alexander the Great, felt so keenly and expressed so felicitously by the following: “My friend is another myself.”[290] It is also from him that Aristotle had borrowed that beautiful definition: “The real friend is one soul that lives in two bodies.”[291] The founder of the Lyceum, in giving such a definition of friendship, spoke rather by theory than by practice, he who reasoning one day upon friendship, cried ingenuously: “Oh, my friends! there are no friends.”[292]