Proverbs 18:1 (BSB)

He who isolates himself pursues selfish desires; he rebels against all sound judgment.

From Proverbs 18. Also in the ESV.

Commentary on Proverbs 18:1

• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Proverbs 18:1: Through desire a man, having separated himself, seeketh [and] intermeddleth with all wisdom. (a) He who loves wisdom will separate himself from all impediments, and give himself wholly to seek it.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Proverbs 18:1: Pro 18:1 This series of proverbs now turns from the fool to the separatist: The separatist seeketh after his own pleasure; Against all that is beneficial he showeth his teeth. The reflexive נפרד has here the same meaning as the Rabbinical פּרשׁ מן־הצּבּוּר, to separate oneself from the congregation, Aboth ii. 5; נפרד denotes a man who separates himself, for he follows his own counsel, Arab.