" Sufis like to say: “This is not a religion; it is religion,” or “Sufism is the essence of all religions,” which provides “a belief in an inner teaching beyond formalized religion.” In other words, Sufism puts spirituality first — getting to the heart of the matter, the lived experience of the Divine. Eckhart does the same; he tried to get deeper than the “formalized” version of Christianity. Sufism explicitly practices what I call Deep Ecumenism, honoring the essence of religious teaching and the lived experience of Divinity, found in all religious traditions. "

― Matthew Fox , Meister Eckhart: A Mystic-Warrior for Our Times