every man (has|hath) a fool in his sleeve
1
used to imply that regardless of how intelligent or wise a person may appear, everyone is capable of making mistakes or acting in a foolish manner at times
The origin of the proverb "every man has a fool in his sleeve" is not clearly tied to a specific text or culture but is rooted in common European wisdom. This proverb serves as a reminder that everyone has their weaknesses and that no one is entirely free from making mistakes. It encourages humility, as it acknowledges that even the most composed individuals have their vulnerabilities.
- Even the most successful businessmen have made foolish decisions at some point in their careers, proving that every man has a fool in his sleeve.