φυλάσσεσθαι
From LSJ
τὸ γὰρ εὖ πράττειν παρὰ τὴν ἀξίαν ἀφορμὴ τοῦ κακῶς φρονεῖν τοῖς ἀνοήτοις γίγνεται → undeserved success engenders folly in unbalanced minds
Greek > English (Woodhouse Verbs Reversed)
(see also φυλάσσω): beware, be on one's guard, be under guard, beware of, guard against, look out, provide against, take care, take precautions against, take precautions