Quitters never win, and winners never quit.
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The adage is wrong.
Winners quit all the time. They just quit everything except what they're really good at. They're not satisfied with being merely okay in a whole bunch of stuff.
If at first you don't succeed, give up before you make yourself look like an ass.

Except not really. I got told some stupid shit as a kid. Post nuggets of wisdom here that turned out to be just nuggets.