One swallow does not make a summer.

Meaning: A single favorable occurrence cannot establish a lasting pattern; sustained evidence requires repetition.

Origin: From Aristotle's Nicomachean Ethics: one swallow does not make a spring, nor does one fine day — and neither does a short spell of good fortune make a person happy. Aristotle's Greek says spring; English adopted summer, and Richard Taverner's 1539 translation of Erasmus's collection of proverbs gave it in English.

Equivalents in French, Spanish, German, and Italian

  • French: Une hirondelle ne fait pas le printemps (literally: One swallow does not make a spring)
  • Spanish: Una golondrina no hace verano (literally: One swallow does not make a summer)
  • German: Eine Schwalbe macht noch keinen Sommer (literally: One swallow does not yet make a summer)
  • Italian: Una rondine non fa l’estate (literally: One swallow does not make a summer)

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