διαφυλακτέον
From LSJ
νᾶφε καὶ μέμνασο ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
Spanish (DGE)
hay que conservar, hay que mantener τὰ καθεστῶτα Anaximen.Rh.1423a31
•hay que mantener, hay que prolongar τοὺς ... ἱδρῶτας Orib.5.30.27.