Let Nothing Disturb Thee
Saint Teresa de Jesús (Avila)
Lines Written in Her Breviary
Let nothing disturb thee,
Nothing affright thee
All things are passing;
God never changeth;
Patient endurance
Attaineth to all things;
Who God possesseth
In nothing is wanting;
Alone God sufficeth.
—H. W. Longfellow (translator).
From: Hispanic Anthology: Poems Translated from the Spanish by English and North American Poets. Collected and arranged by Thomas Walsh. G. P. Putnam's Sons. New York, 1920.

Selection from:
Interior Castle
Introduction
Towards the end of her life, probably near the end of the year 1579, St. Teresa was travelling with three of her nuns from Medina del Campo, across the bleak Castilian plateau, on her way to St. Joséph's, Avila. Accidentally (or, as it would be more accurate to say, providentially) she fell in with an old friend, a Hieronymite, Fray Diego de Yepes. Their meeting took place at an inn in the town of Arévalo, where he had arrived some time previously, and, as was fitting, he had been given the most comfortable room. When the little party of nuns, half frozen but still cheerful, reached the inn, there was mutual delight at the encounter; and Fray Diego not only gave up his room to them but appointed himself their personal servant for the period of their stay. They spent, so he tells us, "a very great part of the night" in conversation about their Divine Master. On the next day it was snowing so hard that no one could leave. So Fray Diego said Mass for the four nuns and gave them Communion, after which they spent the day "as recollectedly as if they had been in their own convent". In the evening, however, St. Teresa had a long conversation with her former confessor, who later was to become her biographer, and in the course of this she recounted to him the story of how she came to write the Interior Castle. The report of this narrative may suitably be given in the words of Fray Diego himself, taken from a letter which he wrote to Fray Luis de León about nine years later.
"This holy Mother," he writes, "had been desirous of obtaining some insight into the beauty of a soul in grace. Just at that time she was commanded to write a treatise on prayer, about which she knew a great deal from experience. On the eve of the festival of the Most Holy Trinity she was thinking what subject she should choose for this treatise, when God, Who disposes all things in due form and order, granted this desire of hers, and gave her a subject. He showed her a most beautiful crystal globe, made in the shape of a castle, and containing seven mansions, in the seventh and innermost of which was the King of Glory, in the greatest splendour, illumining and beautifying them all. The nearer one got to the centre, the stronger was the light; outside the palace limits everything was foul, dark and infested with toads, vipers and other venomous creatures.
"While she was wondering at this beauty, which by God's grace can dwell in the human soul, the light suddenly vanished. Although the King of Glory did not leave the mansions, the crystal globe was plunged into darkness, became as black as coal and emitted an insufferable odour, and the venomous creatures outside the palace boundaries were permitted to enter the castle.
"This was a vision which the holy Mother wished that everyone might see, for it seemed to her that no mortal seeing the beauty and splendour of grace, which sin destroys and changes into such hideousness and misery, could possibly have the temerity to offend God. It was about this vision that she told me on that day, and she spoke so freely both of this and of other things that she realized herself that she had done so and on the next morning remarked to me: 'How I forgot myself last night! I cannot think how it happened. These desires and this love of mine made me lose all sense of proportion. Please God they may have done me some good!' I promised her not to repeat what she had said to anyone during her lifetime."
Some days before she was granted this marvellous vision, St. Teresa had had a very intimate conversation on spiritual matters with P. Jerónimo Gracián; the upshot of this was that she undertook to write another book in which she would expound afresh the teaching on perfection to be found in her Life, at that time in the hands of the Inquisitors. This we learn from a manuscript note, in Gracián's hand, to the sixth chapter of the fourth book of Ribera's biography of St. Teresa:
What happened with regard to the Book of the Mansions is this. Once, when I was her superior, I was talking to her about spiritual matters at Toledo, and she said to me: "Oh, how well that point is put in the book of my life, which is at the Inquisition!" "Well," I said to her, "as we cannot get at that, why not recall what you can of it, and of other things, and write a fresh book and expound the teaching in a general way, without saying to whom the things that you describe have happened." It was in this way that I told her to write this Book of the Mansions, telling her (so as to persuade her the better) to discuss the matter with Dr. Velázquez, who used sometimes to hear her confessions; and he told her to do so too.
Although she did as she was instructed, however, P. Gracián tells us that she made various objections, all of them dictated by her humility. "Why do they want me to write things?" she would ask. "Let learned men, who have studied, do the writing; I am a stupid creature and don't know what I am saying. There are more than enough books written on prayer already. For the love of God, let me get on with my spinning and go to choir and do my religious duties like the other sisters. I am not meant for writing; I have neither the health nor the wits for it."
Such was the origin of the Interior Castle, one of the most celebrated books on mystical theology in existence. It is the most carefully planned and arranged of all that St. Teresa wrote.
Chapter 1
Treats of the beauty and dignity of our souls; makes a comparison by the help of which this may be understood; describes the benefit which comes from understanding it and being aware of the favours which we receive from God; and shows how the door of this castle is prayer.
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. [...]
Now let us return to our beautiful and delightful castle and see how we can enter it. I seem rather to be talking nonsense, for, if this castle is the soul, there can clearly be no question of our entering it. For we ourselves are the castle: and it would be absurd to tell someone to enter a room when he was in it already! But you must understand that there are many ways of "being" in a place. Many souls remain in the outer court of the castle, which is the place occupied by the guards; they are not interested in entering it, and have no idea what there is in that wonderful place, or who dwells in it, or even how many rooms it has. You will have read certain books on prayer which advise the soul to enter within itself: and that is exactly what this means. [...]
Chapter II
Describe the hideousness of a soul in mortal sin, some part of which God was pleased to manifest to a certain person. Says something also of self-knowledge. This chapter is profitable, since it contains some noteworthy matters. Explains in what sense the Mansions are to be understood.
BEFORE passing on, I want you to consider what will be the state of this castle, so beautiful and resplendent this Orient pearl, this tree of life, planted in the living waters of life -- namely, in God -- when the soul falls into a mortal sin. No thicker darkness exists, and there is nothing dark and black which is not much less so than this. You need know only one thing about it -- that, although the Sun Himself, Who has given it all its splendour and beauty, is still there in the centre of the soul, it is as if He were not there for any participation which the soul has in Him, though it is as capable of enjoying Him as is the crystal of reflecting the sun. While in a state like this the soul will find profit in nothing, and hence, being as it is in mortal sin, none of the good works it may do will be of any avail to win it glory; for they will not have their origin in that First Principle, which is God, through Whom alone our virtue is true virtue. And, since this soul has separated itself from Him, it cannot be pleasing in His eyes; for, after all, the intention of a person who commits a mortal sin is not to please Him but to give pleasure to the devil; and, as the devil is darkness itself, the poor soul becomes darkness itself likewise. [...]
[...] Let us now turn to our castle with its many mansions. You must not imagine these mansions as arranged in a row, one behind another, but fix your attention on the centre, the room or palace occupied by the King. Think of a palmito which has many outer rinds surrounding the savoury part within, all of which must be taken away before the centre can be eaten. Just so around this central room are many more, as there also are above it. In speaking of the soul we must always think of it as spacious, ample and lofty; and this can be done without the least exaggeration, for the soul's capacity is much greater than we can realize, and this Sun, Which is in the palace, reaches every part of it. It is very important that no soul which practises prayer, whether little or much, should be subjected to undue constraint or limitation. Since God has given it such dignity, it must be allowed to roam through these mansions -- through those above, those below and those on either side. It must not be compelled to remain for a long time in one single room -- not, at least, unless it is in the room of self-knowledge. How necessary that is (and be sure you understand me here) even to those whom the Lord keeps in the same mansion in which He Himself is! However high a state the soul may have attained, self-knowledge is incumbent upon it, and this it will never be able to neglect even should it so desire. Humility must always be doing its work like a bee making its honey in the hive: without humility all will be lost. Still, we should remember that the bee is constantly flying about from flower to flower, and in the same way, believe me, the soul must sometimes emerge from self-knowledge and soar aloft in meditation upon the greatness and the majesty of its God. Doing this will help it to realize its own baseness better than thinking of its own nature, and it will be freer from the reptiles which enter the first rooms -- that is, the rooms of self-knowledge. For although, as I say, it is through the abundant mercy of God that the soul studies to know itself, yet one can have too much of a good thing, as the saying goes, and believe me, we shall reach much greater heights of virtue by thinking upon the virtue of God than if we stay in our own little plot of ground and tie ourselves down to it completely.
Selection from the electronic edition of E. Allison Peers from the Critical Edition of P. Silverio de Stanta Teresa, C.D.