מְקַצֶּ֣ה רַ֭גְלַיִם חָמָ֣ס שֹׁתֶ֑ה שֹׁלֵ֖חַ דְּבָרִ֣ים בְּיַד־כְּסִֽיל׃
He that sendeth a message by the hand of a fool Cutteth off his own feet, and drinketh damage.
Read kabbalistic (mystical) interpretation of Proverbs 26:6: and classical mystical sources.