PHILOSOPHY, n. A route of many roads leading from nowhere to nothing.

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

“Philosophy,” The Devil’s Dictionary (1911)
    (Source)

Originally published in the "Cynic's Word Book" column in the New York American (1905-01-11), and the "Cynic's Dictionary" column in the San Francisco Examiner (1905-03-18).