A Healthy Mind In a Healthy Body or “a sound mind in a healthy body” (From Latin: Mens Sana in Corpore Sano) is a saying often believed to originate from the Latin satirist and poet Juvenal
Anyway the more probable author of the saying is a far older Greek philosopher Thales of Miletus. (Greek: Νοῦς ὑγιὴς ἐν σώματι ὑγιεῖ )