The groundbreaking classic on the Trappist monk's enthusiasm for and participation in Islamic spirituality. In addition to scholarly articles, this volume includes Merton's own Sufi poems, insightful book reviews, transcriptions from his related lectures, and a selection of works from which he drew particular inspiration, including the work of al-Tirmidhi (d.932), which uses fascinating metaphors to elucidate the difference between the Breast, Heart, Inner Heart, and the Intellect.