one swallow does not a spring make

one swallow does not a spring make

One piece of evidence does not mean that something is definitely the case or is going to happen. A reference to the migration of swallows that happens in the spring or early summer. I know you're excited about your exam grades, but you haven't gotten your report card yet, and one swallow does not a spring make.
See also: does, make, not, one, spring, swallow
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