Iliad 10.224–226

σύν τε δύʼ ἐρχομένω καί τε πρὸ ὃ τοῦ ἐνόησεν

ὅππως κέρδος ἔῃ· μοῦνος δʼ εἴ πέρ τε νοήσῃ

ἀλλά τέ οἱ βράσσων τε νόος, λεπτὴ δέ τε μῆτις.

When two go together, one sees before the other

how advantage may be won. Even if a man thinks of it alone,

his mind is slower, and his counsel thin.