To speak of the merits of this work seems superfluous. It abounds in noble and sublime thoughts, heroic sentiments of love, praise, and gratitude to God, and is full of the most practical lessons of humility, obedience, poverty, and self-denial; &c. Her explanation of the Lord's Prayer is very admirable. The three first chapters are particularly interesting and valuable, as she there mentions the motives by which she was especially induced to compose the work. The style is everywhere simple and pure, yet always rich in illustrations. The interior life of the Saint is drawn to the very letter, in words which really seem to have been inspired. All the hidden secrets of mental prayer, are communicated to us, in which the soul buries herself, and is consumed with burning transports of love; and though we are unable to understand all that the Saint says on this sublime subject, yet we cannot but rise up from the perusal of her words, better men than we were before, more determined to aim at perfection, and to implore the divine assistance and that of our glorious Saint for so important an object.

St. Teresa of Avila's books are an integral part of the Spanish Renaissance literature as well as Christian mysticism and Christian meditation practices. The Interior Castle as written is widely considered to be one of the greatest works on spiritual development. This classic work attracts a new generation of St. Teresa of Avila readers. The Interior Castle is required reading for various college courses and curriculums and is enjoyed reading for many others. St. Teresa of Avila was canonized by Pope Gregory XV in 1622, forty years after her death. In 1970 St. Teresa was named a Doctor of the Church by Pope Paul VI.