In this profound spiritual classic, Fr. Juan G. Arintero guides readers through the five fundamental stages of prayer, showing how the soul advances from vocal prayer to deeper contemplation and union with God. Drawing richly from St. Teresa of Avila, St. John of the Cross, St. Francis de Sales, and St. Thomas Aquinas, he explains the interior transformations that accompany growth in prayer, including aridity, consolation, infused recollection, and the purifying work of grace. Emphasizing that progress is shaped by love and docility to the Holy Spirit rather than rigid technique, he offers practical counsel for overcoming distractions, forming resolutions, and fostering virtue. Rooted in the wisdom of the mystics, this work invites readers to embrace a fervent contemplative life that overflows into charity and apostolic fruitfulness.