The Way To Divine Knowledge

Humanus. Truly, Theophilus, I would proceed no farther at all; and for this good reason, because I should then have nothing to proceed upon. Did I certainly know of an infallible remedy for every disorder of the eyes, only to be had by going to China for it, I should not attempt to persuade a man, who believed his eyes to be sound and good, to leave all that he had, and go to China for this infallible remedy for bad eyes.