The Carmelite background of St. John of the Cross is examined in this work by historian Balbino Velasco, O. Carm. He proposes that his formation as John of St. Matthias, a little studied aspect of the saint’s life, was as much a contributing factor to his eventual participation in the Teresian reform. Translated by Joseph Chalmers, O. Carm. from the original Spanish with a helpful glossary of terms. – Translated by Joseph Chalmers, O.Carm.