John of the Cross
The Catholic Reformation was not only a political and Church policy oriented movement, but it also included major figures such as Ignatius of Loyola, Teresa of Ávila, John of the Cross, Francis de Sales, and Philip Neri, who added to the spirituality of the Catholic Church. Teresa of Avila and John of the Cross were Spanish mystics and reformers of the Carmelite Order, whose ministry focused on interior conversion to Christ, the deepening of prayer, and commitment to God's will. Teresa was given the task of developing and writing about the way to perfection in her love and unity with Christ. Thomas Merton called John of the Cross the greatest of all mystical theologians.