Εἰ θνητὸς εἶ, βέλτιστε, θνητὰ καὶ φρόνει → Mortalis quum sis, intra mortalem sape → Bist sterblich du, mein Bester, denk auch Sterbliches
properly, an adjective from an uncertain base; sardian (λίθος being implied), i.e. (as noun) the gem so called: sardius.
