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For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.

Nicomachean Ethics, bk.1, ch.7,1098 (translated by Sir David Ross).
For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.