Letter 88 — On Liberal and Vocational Studies (§43)

“Let me tell you what evils are due to over-nice exactness, and what an enemy it is of truth! Protagoras declares that one can take either side on any question and debate it with equal success—even on this very question, whether every subject can be debated from either point of view. Nausiphanes holds that in things which seem to exist, there is no difference between existence and non-existence.”