Exodus 18:17 Kabbalah

וַיֹּ֛אמֶר חֹתֵ֥ן מֹשֶׁ֖ה אֵלָ֑יו לֹא־טוֹב֙ הַדָּבָ֔ר אֲשֶׁ֥ר אַתָּ֖ה עֹשֶֽׂה׃

And Moses’father-in-law said unto him: ‘The thing that thou doest is not good.

Read kabbalistic (mystical) interpretation of Exodus 18:17: and classical mystical sources.