[2] Now it is said, that the most sacred sect of the Pythagoreans, among many other excellent doctrines, taught this one also, that it was not well to proceed by the plain ordinary roads, not meaning to urge us to walk among precipices (for it was not their object to weary our feet with labour), but intimating, by a figurative mode of speech, that we ought not, either in respect of our words or actions, to use only such as are ordinary and unchanged;