St John of the Cross (1542–1591)

Saint John of the Cross was a major figure in the Catholic Reformation, a Spanish mystic and Carmelite friar born at Fontiveros, a small village near Ávila. He is renowned for his cooperation with Saint Teresa of Avila in the reformation of the Carmelite order, and for his writings; both his poetry and his studies on the growth of the soul (in the Christian sense of detachment from creatures and attachment to God) are considered the summit of mystical Spanish literature and one of the peaks of all Spanish literature. He is one of the thirty three Doctors of the Church. 

From Wikipedia

See also New Advent 

His works include The Ascent of Mount Carmel, The Dark Night of the Soul, and Spiritual Canticle.

–––––––––––––––––––––––––––––––––––––––––––––

Please report any failed links to Richard. Thanks.