Catholic Church and health care
The famous Mother Teresa of Calcutta established the Missionaries of Charity in the slums of Calcutta in 1948 to work among "the poorest of the poor". Initially founding a school, she then gathered other sisters who "rescued new-born babies abandoned on rubbish heaps; they sought out the sick; they took in lepers, the unemployed, and the mentally ill". Teresa achieved fame in the 1960s and began to establish convents around the world. By the time of her death in 1997, the religious institute she founded had more than 450 centres in over 100 countries.
Ascetical theology
During the 16th century St. Teresa and St. Ignatius of Loyola stand out most prominently owing to the wide-felt influence which they exerted upon the religion of their contemporaries, an influence that is still at work through their writings. The writings of St. Teresa arouse our admiration by the simplicity, clearness and precision of her judgment. Her letters show her to be an enemy of everything that smacks of eccentricity or singularity, sham piety or indiscreet zeal. One of her principal works, the "Way to Perfection", though written primarily for nuns, also contains apposite instructions for those who live in the world. While teaching the way to contemplation, she yet insists that not all are called to it and that there is greater security in the practice of humility, mortification, and the other virtues. Her masterpiece is the "Castle of the Soul", in which she expounds her theory of mysticism under the metaphor of a "castle" with many chambers. The soul resplendent with the beauty of the diamond or crystal is the castle; the various chambers are the various degrees through which the soul must pass before she can dwell in perfect union with God. Scattered throughout the work are many hints of inestimable value for asceticism as applied in everyday life. This fact is undoubtedly due to the well-founded conviction of the saint that even in extraordinary states the ordinary means must not be set aside altogether, so that illusions may be guarded against (cf. J. Zahn, "Introduction to Mysticism" p. 213).