νᾶφε καὶ μέμνασ' ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
subs.
P. and V. μνήμη, ἡ, μνεία, ἡ, V. μνῆστις, ἡ. Memorial: P. and V. μνημεῖον, τό, Ar. and P. μνημόσυνον, τό, P. ὑπόμνημα, τό, V. μνῆμα, τό.