sophrosyne

An ancient Greek ideal of excellence of character — a harmonious balance of self-control, moderation, and sound judgement.

Древнегреческий идеал превосходства характера — гармоничный баланс самообладания, умеренности и здравого суждения.

«The philosopher lived with sophrosyne, never craving excess and never lacking what mattered.»

seen in Oxford English Dictionary