He spent some time as a Carmelite friar before, in 1568, Saint Teresa of Ávila persuaded him to pioneer the reform of the Carmelite order. This was a difficult task and a dangerous one: he suffered imprisonment and severe punishment at the hands of the Church authorities. He died at the monastery of Ubeda in Andalusia on 14 December 1591: His works include two major mystical poems – he is considered one of the great poets of the Spanish language – and detailed commentaries on them and the spiritual truths they convey. He was canonized in 1726 and declared a Doctor of the Church in 1926.