In Menander’s comedy, the Dyskolos or the bad tempered man, our hero Sosistratus has fallen in love with Knemon’s daughter. His companion Chaireas gives him some advice on how to approach Knemon.
εὖ τοῦτ ̓ ἴσθ ̓ ὅτι πρὸς πάντα πράγματ ̓ ἐστὶ πρακτικώτερον εὐκαιρία.
Know this well that in all matters the most effective thing is good timing.
Menander Dyskolos 126