I have been trying almost all my life to work for a true catholicity, a fellowship wherein Christians, Hindus, Buddhists, Muslims, Taoists, Jews and the rest could recognise their common Ground, and worship or meditate together without quarrelling, and yet without abandoning their interesting and colorful differences of method and style. I would not really want to see a Buddha-image on the high altar of St. Peter’s or a crucifix in the Kaaba, but it is being increasingly recognised that at the level of contemplative mysticism (or ‘metaphysic’) there is no essential difference between Zen Buddhists, Sufis, Vedantists, and blessedly silent Trappists. For when one gets into the domain of pure contemplation of the Ground of Being, there is no more talk going on inside the head, and therefore no occasion for disputation. There is simply a consciousness clear as crystal and open to truth, reality, or what is-which, as St. Thomas Aquinas would have said, is what all men call God.
Alan Watts – The Supreme Truth (1972 Preface)