richmahn_en_tn/pro/18/01.md

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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. Alternate translation: "he disagrees with all sound judgment" (See: rc://en/ta/man/translate/figs-personification)

sound judgment

"good judgment" or "wise choices"