Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
Plato, Apology 21dSpanish (DGE)
indecl. valle LXX Ez.39.12, 15, Io.18.16 (var.), 2Pa.28.3 (var.).