One swallow doesn't make a summer?

Even if something good happens to you, it doesn't mean there will be many good things happening too. For example: Bill passed an exam in Math yesterday, but one swallow doesn't make a summer. He still needs to work on it continuously since he is not good at it.

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Does one swallow make a summer?  One swallow does not make a summer?  What does one swallow doesn't make the whole summer?  What does one swallow does not make a full summer mean?