FUTURE, n. That period of time in which our affairs prosper, our friends are true, and our happiness is assured.

Ambrose Bierce (1842–1914?) American writer and journalist
“Future,” 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 (1885-02-21).