intentionally
From LSJ
ὁ δὲ πείσεται εἰς ἀγαθόν περ → he will obey you to his profit, he will obey you for his own good end
English > Greek (Woodhouse)
adv.
P. and V. ἑκουσίως, ἐκ προνοίας (Eur., H.F. 598), P. ἐκ παρασκευῆς, V. ἐξ ἑκουσίας; see deliberately. Or use adj., P. and V. ἑκών; e. g., kill a person intentionally: P. and V. ἑκὼν ἀποκτείνειν (τινά).