Euripides, Hippolytus 916-920

O humanity, you miss the mark so often! You teach so many skills, and you have contrived and discovered all things, yet why do you not know nor seek to teach fools to reason rightly?

ὦ πόλλ᾽ ἁμαρτάνοντες ἄνθρωποι μάτην,
τί δὴ τέχνας μὲν μυρίας διδάσκετε
καὶ πάντα μηχανᾶσθε κἀξευρίσκετε,
ἓν δ᾽ οὐκ ἐπίστασθ᾽ οὐδ᾽ ἐθηράσασθέ πω,
φρονεῖν διδάσκειν οἷσιν οὐκ ἔνεστι νοῦς;