Never believe straight off in a man's unhappiness. Ask him if he can still sleep. If the answer's yes, all's well. That is enough.
Source: The narrator (Ferdinand Bardamu), in Journey to the End of the Night (1932; tr. 1934; 1966, p. 371).
-- Louis-Ferdinand Celine, (May 27 1894-1961), French writer, physician; He travelled extensively on medical missions for the League of Nations, and wrote novels in his spare time.