οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
rĕtĭnentĭa: ae, f. retineo, II.,I a retaining in the memory, recollection: actarum rerum, Lucr. 3, 675: nostri, id. 3, 851.
