οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
2ᵉ sg. épq. sbj. ao.2 de βάλλω.
βάλῃσθα: эп. 2 л. sing. aor. conjct. к βάλλω.
