παραφυλακτέον
From LSJ
Μηκέθ᾽ ὅλως περὶ τοῦ οἷόν τινα εἶναι τὸν ἀγαθὸν ἄνδρα διαλέγεσθαι, ἀλλὰ εἶναι τοιοῦτον. → Waste no more time arguing what a good man should be. Be one.
English (LSJ)
A one must observe, Vett. Val.314.34, Heph.Astr.1.23, Eust.1352.15. 2 one must avoid, Aët.3.25 ; one must beware, Cod.Just.1.3.52.3. II Adj. -τέος, α, ον, to be avoided, Aët.7.24.