The Persian proverb stick a needle into yourself before using an awl on others 
teaches the importance of self-reflection and fairness. 
It means that before criticizing or judging others, you should examine your own behavior and make sure you hold yourself to the same standards.
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Imagine this: before you poke someone else with a giant needle of criticism, try giving yourself a prick first.
Basically, it says, “Check yourself before you wreck someone else!” 
In other words, don’t judge people if you’re guilty of the same thing.