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1) The person has to be a canonized saint.
2) The person must have left outstanding teachings for others to learn something about the faith.
3) The Church and the Holy Father must give their approval.
from Modern Catholic Dictionary by John A. Hardon, S.J. Doubleday & Co., Inc. Garden City, NY 1980
Doctor of the Church. A title given since the Middle Ages to certain saints whose writing or preaching is outstanding for guiding the faithful in all periods of the Church's history. Originally the Western Fathers of the Church, Gregory the Great, Ambrose, Augustine, and Jerome, were considered the great doctors of the Church. But the Church has officially added many more names to the original four, including Sts. Catherine of Siena (1347) and Theresa of Avila (1515-82):
Teresa of Avila was made a Doctor of the Church in 1970.
St. Teresa of Avila was made a saint in 1622, and a Doctor in 1970.
St. Teresa of Avila was declared a Doctor of the Church by Pope Paul VI on September 27, 1970.
Both Teresa of Avila and Catherine of Siena were declared Doctors of the Church in 1970.
There are two: St. Teresa of Avila and St. Therese of Lisieux.
St. Teresa of Avila's Church - New York City - was created in 1933.
Both Teresa of Avila and Catherine of Siena were declared Doctors of the Church in 1970.
There are three female doctors of the Church: St. Catherine of Siena, St. Teresa of Avila and St. Therese of Lisieux.
St. Teresa of Avila was declared a Doctor of the Church in 1970.
Teresa of Avila was from the town of Avila, Spain
Yes, Saint Teresa and Saint Thérèse of Lisieux are different saints. Saint Teresa typically refers to Saint Teresa of Avila, a Spanish mystic and Doctor of the Church, while Saint Thérèse of Lisieux, also known as "The Little Flower," is a French Carmelite nun and Doctor of the Church. Both are highly regarded for their spiritual writings and devotion to God.
St. Teresa of Avila is known for her strong faith, humility, and devotion to prayer. She was also a skilled writer and reformer within the Catholic Church.