οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
Use P. and V. ἀνόσιος συνουσία, ἡ, V. συγγενὴς γάμος, ὁ.