One swallow does not make a spring, nor does one fine day.
One sound blow will serve to undo us all.
My boy, one small breeze doesn't make a wind storm.
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.
A single event can shape our lives or change the course of history.
One game is never going to define a player.
One bad day could turn into a bad year if you're not careful. Or, a bad rest of your life if you're not careful. Because of one day!
Often a single experience will open the young soul to music for a whole lifetime
One swallow alone does not make a summer.
One line on a Tom Selleck sitcom does not a career make.
One and done, Home Run Derby champion. It was a cool experience. I enjoyed it all, but I don't think I really need to go out there and do it again.
Any one game in baseball doesn't tell you that much, just as any one poll doesn't tell you that much.
In some ways, trying to win cups is more fraught than trying to win the league, as one really bad night and everything comes crashing down.
One swallow maketh not summer.
One faire day in winter makes not birds merrie.