For, tell me, what is more difficult than to walk along a tight rope, as if on level ground, and when walking on high to dress and undress, as if sitting on a couch? Does not the performance seem to us to be so frightful, that we are not even willing to look at it, but are terrified and tremble at the very sight? And tell me, what is more difficult than to hold a pole upon your face, and when you have put up a child upon it, to perform innumerable feats and delight the spectators? And what is more difficult than to play at ball with swords? And tell me what is harder than thoroughly to search out the bottom of the sea? And one might mention innumerable other arts.