Pride goes before a fall

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Pride goes before a fall.

 and Pride goeth before a fall.
Prov. If you are too proud and overconfident, you will make mistakes leading to your defeat. (Biblical.) Sue: I'm the best student in my history class. I'm sure I can pass the exam without studying very hard. Sam: Be careful. Pride goes before a fall, you know.
See also: before, fall, goes, pride