While I was beseeching Our Lord to-day that He would speak through me, since I could find nothing to say and had no idea how to begin to carry out the obligation laid upon me by obedience, a thought occurred to me which I will now set down, in order to have some foundation on which to build. I began to think of the soul as if it were a castle made of a single diamond or of very clear crystal, in which there are many rooms, just as in Heaven there are many mansions. Now if we think carefully over this, sisters, the soul of the righteous man is nothing but a paradise, in which, as God tells us, He takes His delight. For what do you think a room will be like which is the delight of a King so mighty, so wise, so pure and so full of all that is good? I can find nothing with which to compare the great beauty of a soul and its great capacity. In fact, however acute our intellects may be, They will no more be able to attain to a comprehension of this than to an understanding of God; for, as He Himself says, He created us in His image and likeness. Now if this is so -- and it is -- there is no point in our fatiguing ourselves by attempting to comprehend the beauty of this castle; for, though it is His creature, and there is therefore as much difference between it and God as between creature and Creator, the very fact that His Majesty says it is made in His image means that we can hardly form any conception of the soul's great dignity and beauty.
It is no small pity, and should cause us no little shame, that, through our own fault, we do not understand ourselves, or know who we are. Would it not be a sign of great ignorance, my daughters, if a person were asked who he was, and could not say, and had no idea who his father or his mother was, or from what country he came? Though that is great stupidity, our own is incomparably greater if we make no attempt to discover what we are, and only know that we are living in these bodies, and have a vague idea, because we have heard it and because our Faith tells us so, that we possess souls. As to what good qualities there may be in our souls, or Who dwells within them, or how precious they are -- those are things which we seldom consider and so we trouble little about carefully preserving the soul's beauty. All our interest is centred in the rough setting of the diamond, and in the outer wall of the castle -- that is to say, in these bodies of ours.
--Teresa of Avila, The Interior Castle, First Mansions, Chapter I