No one is ignorant that there are two avenues by which opinions are received into the soul, which are its two principal powers: the understanding and the will. The more natural is that of the understanding, for we should never consent to any but demonstrated truths; but the more common, though the one contrary to nature, is that of the will; for all men are almost led to believe not of proof, but by attraction. This way is base, ignoble, and irrelevant: every one therefore disavows it. Each one professes to believe and even to love nothing but what he knows to be worthy of belief and love. I do not speak here of divine truths, which I shall take care not to comprise under the art of persuasion, because they are infinitely superior to nature: God alone can place them in the soul and in such a way as it pleases him. I know that he has desired that they should enter from the heart into the mind, and not from the mind into the heart, to humiliate that proud power of reasoning that pretends to the right to be the judge of the things that the will chooses; and to cure this infirm will which is wholly corrupted by its filthy attachments. And thence it comes that whilst in speaking of human things, we say that it is necessary to know them before we can love them, which has passed into a proverb, the saints on the contrary say in speaking of divine things that it is necessary to love them in order to know them, and that we only enter truth through charity, from which they have made one of their most useful maxims.