en_tn_lite_do_not_use/pro/18/01.md

isolates himself

"keeps away from other people"

quarrels with all sound judgment

This speaks of a person disagreeing with sound judgment as if "sound judgment" were a person he fought with. AT: "he disagrees with all sound judgment" (See: rc://en/ta/man/translate/figs-personification)

sound judgment

"good judgment" or "wise choices"