οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
ample: P. and V. μέγας, μακρός, εὐρύς.
convenient: P. ἐπίκαιρος, P. and V. ἐπιτήδειος.