The doctrine of the Atonement is incomplete, it is irrational, until it is completed by the doctrine of the Spirit, the Giver of Life. As He is the source of life in all living organisms, so He is in Christians the source of the Christ-life. He comes to dwell in us, not simply as the Spirit, but as the Spirit of Christ--the Spirit Who first created, and then "descended" to abide in the Perfect Manhood. That gift of the Spirit of Christ as the indwelling source of the life of Christ, and the means of the Presence of Christ in us, is the characteristic gift of the New Dispensation. It is His work to make us ever more and more partakers of Christ, to be perpetually feeding us with His flesh and blood. And, as we are about to speak of the Holy Communion, it is well to insist first on this, that the work of the Spirit in there feeding us with the flesh and blood of the Son of man is a continuous process. It is of the very essence of what is meant by being a Christian. "If any man have not the Spirit of Christ, he is none of His." The sixth chapter of St. John's Gospel is not a mere prediction of the Eucharist. It is the revelation of that principle of which the Eucharist is an illustration. Our Communions are the supreme moments, the crises, in a process which is for ever going on, the feeding of us, by the Spirit, with the flesh and blood, the holy and victorious manhood, of the Redeemer. What relation, then, can this spiritual process have to the material substances, to the bread and wine which are used in the Eucharist? This question at once opens out into the larger one, as to the relation between matter and spirit. Now, that question could not be dealt with at all satisfactorily without undertaking a vastly larger task than we are prepared for at the present moment. We should have to ask, What is, after all, meant by "matter," and what by "spirit"? But something may be achieved on a much humbler scale. It will suffice for our present purpose to concentrate our attention on a remarkable fact which seems to underlie all our experience. And we will approach the statement of this fact by first recalling the familiar definition of a sacrament, which fastens upon the union of the outward and visible with the inward and invisible as being the essence of what is meant by a sacrament. Now, the fact we have in view is this: _every_ outward object in the world is, in this respect, a sacrament. What we seem to see is everywhere spirit working through what we call "material" objects. That sacramental principle of the universe is the very principle which underlies our Lord's parables of Nature. Speaking more accurately, we see in "matter" (1) the means of the self-revelation of spirit; (2) the instrument by which spirit acts.