After this emphasis upon obedience as the organ of spiritual knowledge some one may ask what provision we are making for infallibility and for inspiration. We can only say that we are dealing with a Book which has come out of concrete life, and that in concrete life not much consideration is given to abstract infallibility. In daily experience the righteous soul becomes increasingly sure of itself. To return for the moment to Paul, we may think of the certainty with which he grasped the thought of the reward which would be his. The time of his departure, or, of his unmooring, was at hand. He was perfectly confident that he was to go on longer voyages of spiritual discovery and exploration. Can we say that this splendid outburst came from devotion to an abstract formula? Did it not, rather, spring from the sources of life within him-sources opened and developed by the experiences through which he passed? The biblical heroes wrought and suffered through living confidence in the forces which were bearing them on and up. They would have answered questions about abstract infallibility with emphatic avowals as to the firmness of their own belief. In other words, they could have relied upon their life itself as its own best witness to itself. They felt alive and ready to go whithersoever life might lead. And so with inspiration. It is the merest commonplace to repeat that the inspiration of the Scriptures must show itself in their power to inspire those who partake of their life. Does a fresh moral and spiritual air blow through them? Is there in them anything that men can breathe? Anything upon which men can build themselves into moral strength? This is the final test of inspiration. Physical breathing is in itself a mystery, but we know when the air invigorates us. Abstract doctrine of inspiration apart from life and experience is a very stifling affair compared with inspiration conceived of as a breath of life. The scriptural doctrine is that the man who does the will finds himself able to breathe more deeply of the truth of God; and that the very breath itself will satisfy him, and by satisfying him convince him that it is the breath of life.