One swallow doesn’t make a summer
Definition 1 of 1
Pro Tip 1/3Cautious Conclusion
Encourages not rushing to judgement based on limited evidence. 
He won once, but one swallow doesn’t make a summer.
Pro Tip 2/3Consistency Required
Stresses the importance of repeated success or behavior to prove a consistent trend. 
She was punctual today, but one swallow doesn’t make a summer.
Pro Tip 3/3Not Literal Birds
Demonstrates that 'swallow' and 'summer' are metaphors, not to be understood literally. 
Don’t look for birds; one swallow doesn’t make a summer is about evidence, not the season.