νᾶφε καὶ μέμνασο ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
per-cautus: a, um, adj.,I very cautious, Cic. Q. Fr. 1, 1, 6, § 18.
percautus, a, um, très circonspect : Cic. Q. 1, 1, 18.