[70] [cap.14] [Yonge. 9] But Critolaus, in arguing in support of his opinion, brought forward an argument of this kind, —"That which is the cause to man of his being in health is itself free from disease, and, in like manner, the cause of his keeping awake must itself be sleepless; and if this is the case, that which is the cause of his existing for ever must itself also be everlasting." Now the cause of man’s existing for ever is the world, since it is so to all other things whatever; therefore the world also is immortal.