“The man who laughs has simply not yet had the terrible news.”
"To Those Born Later", part of the Svendborg Poems (1939)
quoted in Poems, 1913-1956, p. 318
Variation: He who laughs last has not yet heard the bad news.
German: Wer jetzt noch lacht, hat die neuesten Nachrichten noch nicht gehört.
Poems, 1913-1956 (1976)