τεχναστέον
From LSJ
νᾶφε καὶ μέμνασ' ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
English (LSJ)
A one must employ subtlety, ὅπως ἂν εὐπορία γένοιτο Arist.Pol.1320a35.
Greek (Liddell-Scott)
τεχναστέον: δεῖ τεχνάζειν, ἴδε τεχνάζω ΙΙ. 1.