William James, The Letters of William James, Vol…
“ I have frankly to confess that my "Varieties" carried "theory" as far as I could then carry it, and that I can carry it no farther today. I can't see clearly over that edge. Yet I am sure that tracks have got to be made there—I think that the fixed point with me is the conviction that our "rational" consciousness touches but a portion of the real universe and that our life is fed by the "mystical" region as well. I have no mystical experience of my own, but just enough of the germ of mysticism in me to recognize the region from which their voice comes when I hear it. ”
