861. Since, therefore, the human understanding is full of fallacies arising from the corporeal senses, so that it is formed by mere fallacies, and thus into mere fallacies, and in consequence there is nothing but darkness there, it is on this account surprising that any one of sound mind, when he is willing to think aright, should want to maintain, or be willing to say, that he will believe nothing of those things which are of faith, or which are of light, or which are of heaven, still less those which are Divine, unless he perceives it.