The Teaching about the Constituents makes all teaching futile.

But if, as these say, the Constituents of Good and Evil overcome, and are overcome, they are able to believe in a Mixing of Good and Evil, just as if they denied that there is a Mixing, then they are able to believe that Freewill exists. But if they say that, when the evil Constituent is large, Freewill is subject to compulsion ; what, then, is it that the Heretics teach in their Congregations except the Error which they have been taught ? For if they teach it is because there is Freewill; supposing there is no Freewill, let them shut their mouths and not teach.