One mustn't criticize other people on grounds where he can't stand perpendicular himself

Summary

This quote suggests that one should refrain from criticizing others in areas where they themselves struggle or are not adept. It implies that before casting judgment on someone else's abilities or actions, one should first ensure that they possess the necessary skills or standing to provide fair and valid critique. In essence, the quote advocates for empathy, humility, and self-reflection before passing judgment on others.

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