οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
v. ἠγασάμην.
ἠγασσάμην: эп. aor. к ἄγαμαι.