eine Schwalbe macht noch keinen Sommer

Literally, “one swallow still doesn't make a summer”, a calque of Ancient Greek μία χελιδὼν ἔαρ οὐ ποιεῖ (mía khelidṑn éar ou poieî, “one swallow does not make a spring”); the reference to summer instead of spring is shared with various other European languages (see the descendants at the Greek entry).

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eine Schwalbe macht noch keinen Sommer

1. one swallow does not a summer make