For my part, I do not see that this can mean anything less than that Christ is Divine, that in Him we have God, and in Him touch the actual Source of all life. In Him we have the one thing within our reach which is not earth-grown, the one uncorrupted Source of life to which we can turn from the inadequacy, impurity, and emptiness of a sin-sick world. No pebble lies hid in this bread on which we can break our teeth; no sweetness in the mouth turning afterwards to bitterness, but a new, uncontaminated food, prepared independently of all defiling influences, and accessible to all. Christ is the Bread from heaven, because in Christ God gives Himself to us, that by His life we may live.
There is another sense in which Christ probably used the word "living." In contrast to the dead bread He had given them He was alive. The same law seems to hold good of our physical and of our spiritual life. We cannot sustain physical life except by using as food that which has been alive. The nutritive properties of the earth and the air must have been assimilated for us by living plants and animals before we can use them. The plant sucks sustenance out of the earth--we can live upon the plant but not on the earth. The ox finds ample nourishment in grass; we can live on the ox but not on the grass. And so with spiritual nutriment. Abstract truth we can make little of at first hand; it needs to be embodied in a living form before we can live upon it. Even God is remote and abstract, and non-Christian theism makes thin-blooded and spectral worshippers; it is when the Word becomes flesh; when the hidden reason of all things takes human form and steps out on the earth before us, that truth becomes nutritive, and God our life.
4. Still more explicitly Christ says: "The bread which I will give is My flesh, which I will give for the life of the world." For it is in this great act of dying that He becomes the Bread of Life. God sharing with us to the uttermost; God proving that His will is our righteousness; God bearing our sorrows and our sins; God coming into our human race, and becoming a part of its history--all this is seen in the cross of Christ; but it is also seen that absolute love for men, and absolute submission to God, were the moving forces of Christ's life. He was obedient even unto death. This was _His_ life, and by the cross He made it ours. The cross subdues our hearts to Him, and gives us to feel that self-sacrifice is the true life of man.
A man in a sickly state of _body_ has sometimes to make it matter of consideration, or even of consultation, what he shall eat. Were anyone to take the same thought about his spiritual condition, and seriously ponder what would bring health to his spirit, what would rid it of distaste for what is right, and give it strength and purity to delight in God and in all good, he would probably conclude that a clear and influential exhibition of God's goodness, and of the fatal effects of sin, a convincing exhibition, an exhibition in real life, of the unutterable hatefulness of sin, and inconceivable desirableness of God; an exhibition also which should at the same time open for us a way from sin to God--this, the inquirer would conclude, would bring life to the spirit. It is such an exhibition of God and of sin, and such a way out of sin to God, as we have in Christ's death.
5. How are we to avail ourselves of the life that is in Christ? As the Jews asked, _How_ can this man give us His flesh to eat? Our Lord Himself uses several terms to express the act by which we make use of Him as the Bread of Life. "He that believeth on Me," "He that cometh to Me," "He that eateth My flesh and drinketh My blood, hath eternal life." Each of these expressions has its own significance. Belief must come first--belief that Christ is sent to give us life; belief that it depends upon our connection with that one Person whether we shall or shall not have life eternal. We must also "come to Him." The people He was addressing had followed Him for miles, and had found Him and were speaking to Him, but they had not _come_ to Him. To come to Him is to approach Him in spirit and with submissive trust; it is to commit ourselves to Him as our Lord; it is to rest in Him as our all; it is to come to Him with open heart, accepting Him as all He claims to be; it is to meet the eye of a present, living Christ, who knows what is in man, and to say to Him "I am Thine, Thine most gladly, Thine for evermore."