Father Gabriel of St. Mary Magdalen, O.C.D., was a Discalced Carmelite priest who became one of the most revered masters of the spiritual life. He acquired a vast knowledge of the ways that lead to holiness and to union with God. His experience with souls, whom he guided to the heights of perfection, was outstanding. He was an expert in the spiritual and mystical doctrine of St. Teresa of Jesus (Avila) and of St. John of the Cross. The Discalced Carmelite nuns of the Monastery of St. Joseph in Rome were the heirs of the Father Gabriel's vast output of published works and private manuscripts. For ten years, he guided these nuns as their confessor and spiritual director, and it was they who helped him to arrange his material in line with the course of the liturgical year, while following the ascent of the soul to transforming union with God, or to "Divine Intimacy."