Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.
brĕvĭlŏquentĭa: ae, f. brevis-loquentia,
I brevity of speech: breviloquentiam in dicendo colat, an expression of Cicero, censured by Seneca ap. Gell. 12, 2, 7.