But, as appears, we incline to ideas founded on opinion, though they be contrary, rather than to the truth. For it is austere and grave. Now, since there are three states of the soul—ignorance, opinion, knowledge—those who are in ignorance are the Gentiles, those in knowledge, the true Church, and those in opinion, the Heretics. Nothing, then, can be more clearly seen than those, who know, making affirmations about what they know, and the others respecting what they hold on the strength of opinion, as far as respects affirmation without proof.