Opportunity knocks but once

Meaning: Chances don't come twice; seize them when they appear.

Origin: The idea is ancient: the Latin writer Publilius Syrus observed that opportunity is seldom offered and easily lost. Early English versions speak of fortune knocking rather than opportunity, and the "opportunity" wording dates from the late 19th century. John Dos Passos used "opportunity knocks but once" in his novel The 42nd Parallel (1930).

Equivalents in French, Spanish, Japanese, and German

  • French: L'occasion ne se présente qu'une fois (literally: Opportunity presents itself only once)
  • Spanish: La oportunidad llama solo una vez (literally: Opportunity knocks only once)
  • Japanese: 好機は二度と来ない (Kōki wa nido to konai) (literally: Good opportunity does not come twice)
  • German: Man muss die Gelegenheit beim Schopfe packen (literally: One must grab opportunity by the forelock)

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