γνωριστέον
From LSJ
Ῥύου δὲ σαυτὸν παντὸς ἐκ φαύλου τρόπου → Ex omni more malefico tete eruas → Bewahre dich vor jeder üblen Lebensart
English (LSJ)
A one must know, Arist.EN1180b22; one may recognize, Alex.Trall.1.15.
Greek (Liddell-Scott)
γνωριστέον: ῥημ. ἐπίθ., πρέπει τις νὰ γνωρίσῃ, Ἀριστ. Ἠθ. Ν. 10. 9,16.