St John of the Cross

St. John of the Cross, author of "Dark Night of the Soul" (sometimes I consider this my biography!) worked closely with St. Teresa of Avila to reform the Carmelite order. He originally wanted to join a more ascetic order, but she told him she wanted him to help her conduct the reform.
For this he was imprisoned and publicly disgraced by his brothers, further serving to detach him from this world.Pope Pius XI declaed him a doctor of the Church in 1926.

"With what procrastinations do you wait, since from this very moment you can love God in your heart?" Excerpted from Prayer of a Soul Taken with Love — St. John of the Cross.