EDUCATION, n. That which discloses to the wise and disguises from the foolish their lack of understanding.

Ambrose Bierce (1842–1914?) American writer and journalist

“Education,” The Cynic’s Word Book (1906)
    (Source)

Included in The Devil's Dictionary (1911). Originally published in the "Devil's Dictionary" column in the San Francisco Wasp (1882-12-23).