οὐχ ἑκὼν ποιεῖν τι

From LSJ

Μί' ἐστὶν ἀρετὴ τἄτοπον φεύγειν ἀεί → Numquam non fugere inepta , et hoc virtutis est → Die einzge Tugend: meiden, was abwegig ist

Menander, Monostichoi, 339

Greek > English (Woodhouse)

be loath to do a thing