These interior matters are so obscure to the mind that anyone with as little learning as I will be sure to have to say many superfluous and even irrelevant things in order to say a single one that is to the point. The reader must have patience with me, as I have with myself when writing about things of which I know nothing; for really I sometimes take up my paper, like a perfect fool, with no idea of what to say or of how to begin. I fully realize how important it is for you that I should explain certain interior matters to the best of my ability; for we continually hear what a good thing prayer is, and our Constitutions oblige us to engage in it for so many hours daily, yet they tell us nothing beyond what we ourselves have to do and say very little about the work done by the Lord in the soul -- I mean, supernatural work. As I describe the things He does, and give various explanations of them, it will be very helpful for us to think of this celestial building which is within us and is so little understood by mortals, although many of them frequent it. And although the Lord has thrown some light upon many matters of which I have written, I do not think I have understood some of them, especially the most difficult, as well as I do now. The trouble, as I have said, is that, before I can get to them, I shall have to explain many things that are well known -- it is bound to be so when a person is as stupid as I.