Outward things are easily discussed; those things which touch the surface of our life we may debate and at times laugh and joke about in public. Of our hopes and fears, our disappointments and discouragements we may hint in the sweet confidences of love. Still below these there is an unsurveyed region of reality, a world of yearnings and gropings, strengths and weaknesses that reveal their existence, if at all, not in words and phrases, but in glimmerings of joy or sorrow that mantle the face, in the tenderer tones, the firmer step, the kindlier smile, in unwonted flashes of eye-light. Prayer and Worship are words that point to these deeper strata of being. –From the introduction