διαφυλακτέον

From LSJ

ἁρμονίη ἀφανὴς φανερῆς κρείττων → the hidden attunement is better than the obvi­ous one, invisible connection is stronger than visi­ble, harmony we can't see is stronger than harmony we can, unseen harmony is stronger than what we can see

Source

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.