折疑論 2.210

2.210

是以聖人因事而立制。理無常守（自古聖人因其事而設立制度。其理雖設而固無常守者也）。

Therefore, sages establish institutions according to circumstances; principle has no fixed preservation (since antiquity, sages have established systems according to circumstances; although principle is established, it inherently has no rigid preservation).