9. Now, no one is so egregiously silly as to ask, "How do you know that a life of unchangeable wisdom is preferable to one of change?" For that very truth about which he asks, how I know it? is unchangeably fixed in the minds of all men, and presented to their common contemplation. And the man who does not see it is like a blind man in the sun, whom it profits nothing that the splendour of its light, so clear and so near, is poured into his very eyeballs. The man, on the other hand, who sees, but shrinks from this truth, is weak in his mental vision from dwelling long among the shadows of the flesh. And thus men are driven back from their native land by the contrary blasts of evil habits, and pursue lower and less valuable objects in preference to that which they own to be more excellent and more worthy.