νᾶφε καὶ μέμνασο ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
P. βαρύτης, ἡ.
industry: P. φιλοπονία, ἡ, φιλεργία, ἡ.
difficulty: P. and V. ἀπορία, ἡ, δυσχέρεια, ἡ.