Lingo
a postern door makes a thief
used to caution against creating opportunities for wrongdoing or crime, as even an honest person may be tempted to engage in wrongdoing if an opportunity presents itself
The origin of the proverb "a postern door makes a thief" can be traced to English-speaking cultures, where a "postern door" refers to a back or secret door that may be used for sneaky or unauthorized entry. The saying highlights that permitting hidden opportunities or actions can encourage dishonesty or wrongdoing. It serves as a reminder that transparency and openness are important in preventing unethical behavior, as secrecy can often lead to trouble.
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