Leaving her father's home secretly at the age of 20, Teresa entered the convent of the Incarnation of the Carmelites outside Ávila. In the cloister, she suffered greatly from illness. Early in her sickness, she experienced periods of religious ecstasy through the use of the devotional book "Tercer abecedario espiritual," translated as the Third Spiritual Alphabet (published in 1527 and written by Francisco de Osuna). This work, following the example of similar writings of medieval mystics, consisted of directions for examinations of conscience and for spiritual self-concentration and inner contemplation (known in mystical nomenclature as oratio recollectionis or oratio mentalis). She also employed other mystical ascetic works such as the Tractatus de oratione et meditatione of Saint Peter of Alcantara, and perhaps many of those upon which Saint Ignatius of Loyola based his Spiritual Exercises and possibly the Spiritual Exercises themselves.
Around 1556, various friends suggested that her newfound knowledge was diabolical, not divine. She began to inflict various tortures and mortifications of the flesh upon herself. But her confessor, the Jesuit Saint Francis Borgia, reassured her of the divine inspiration of her thoughts. On St. Peter's Day in 1559, Teresa became firmly convinced that Jesus Christ presented himself to her in bodily form, though invisible. These visions of Jesus Christ lasted almost uninterrupted for more than two years. In another vision, a seraph drove the fiery point of a golden lance repeatedly through her heart, causing an ineffable spiritual-bodily pain.
In 1560 she resolved to reform the monastery that had, she thought, departed from the order's original intention and become insufficiently austere. Her proposed reforms included strict enclosure (the nuns were not to go to parties and social gatherings in town, or to have social visitors at the convent, but to stay in the convent and pray and study most of their waking hours) and discalcing (literally, taking off one's shoes, a symbol of poverty, humility, and the simple life, uncluttered by luxuries and other distractions). In 1562 she opened a new monastery in Avila, over much opposition in the town and from the older monastery. At length Teresa was given permission to proceed with her reforms, and she traveled throughout Spain establishing seventeen houses of Carmelites of the Strict (or Reformed) Observance (the others are called Carmelites of the Ancient Observance). The reformed houses were small, poor, disciplined, and strictly enclosed.
Her final illness overtook her on one of her journeys from Burgos to Alba de Tormes. She died in 1582, just as Catholic nations were making the switch from the Julian to the Gregorian calendar, which required the removal of October 5–14 from the calendar. She died either before midnight of October 14 or early in the morning of October 15, which is celebrated as her feast day.
Teresa of Avila - 15 October - Monastic and Reformer
O God, who by the Holy Spirit didst move Teresa of Avila to manifest to thy Church the way of perfection: Grant us, we beseech thee, to be nourished by her excellent teaching, and enkindle within us a lively and unquenchable longing for true holiness; through Jesus Christ, the joy of loving hearts, who with thee and the Holy Ghost liveth and reigneth, one God, for ever and ever. Amen.
The Epistle - Romans 8:22‑27
The Gospel - St. Matthew 5:13‑16
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