Juan de Yepes Álvarez was born in 1542 in Fontiveros, a small town on the Castilian plateau, the son of a weaver who died young and left the family in poverty. He worked in a hospital as a young man, received a Jesuit education in Medina del Campo, and entered the Carmelite order in 1563. After studying theology at Salamanca, he was ordained a priest in 1567, the same year he met Teresa of Ávila, who persuaded him to join her effort to restore the original austerity of Carmelite life rather than transfer to the Carthusians as he had intended.
The reform he helped lead, producing the branch known as the Discalced Carmelites, was fiercely contested within the order. In 1577 friars opposed to the reform abducted him and held him for nine months in a small cell in Toledo, where he was subjected to cold, hunger, and regular physical punishment. It was in that confinement, and in the period following his escape, that he composed the poems on which his reputation permanently rests — among them the *Cántico Espiritual* and *Noche Oscura del Alma*. He later wrote the prose commentaries that interpreted these poems as sustained accounts of the soul's movement toward union with God.
Those commentaries — *The Ascent of Mount Carmel*, *The Dark Night*, *The Spiritual Canticle*, and *The Living Flame of Love* — gave the Christian tradition a precise and demanding vocabulary for contemplative experience. John described the progressive stripping away of attachment to created things, including consoling religious feeling, as the necessary path toward a union that is finally beyond image or concept. He was canonized in 1726 and named a Doctor of the Church in 1926.
His work remains a primary reference point for anyone attempting to think carefully about what it costs, and what it means, to seek God without reservation.