Letter 88 — On Liberal and Vocational Studies (§44)

“Parmenides maintains that nothing exists of all this which seems to exist, except the universe alone. Zeno of Elea removed all the difficulties by removing one; for he declares that nothing exists. The Pyrrhonean, Megarian, Eretrian, and Academic schools are all engaged in practically the same task; they have introduced a new knowledge, non-knowledge.”