For the most part, of course, the presence and action of the great spiritual universe surrounding us is no more noticed by us than the pressure of air on our bodies, or the action of light. Our field of attention is not wide enough for that; our spiritual senses are not sufficiently alert. . . . But when, for one reason or another, we begin to wake up a little bit, to lift the nose from the ground and notice that spiritual light and that spiritual atmosphere as real constituents of our human world; then, the whole situation is changed. Our horizon is widened, our experience is enormously enriched, and at the same time our responsibilities are enlarged.
— Evelyn Underhill, The Spiritual Life