ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
subs.
Depth: P. and V. βάθος, τό; see depth. Wisdom: P. and V. σοφία, ἡ, σύνεσις, ἡ, τό συνετόν.
