The kingdom of Heaven, in its ways, has many similitudes in the kingdom of nature. The law of the universe is, the giving of the lower for the sake of the higher. The worlds are built on the principle of sacrifice. At the bottom of the scale, we have, for example, lifeless matter. But this is put under contribution to force, and simple matter is organized into systems. And this giving comes under a law; we call it gravitation. Then this in turn comes under contribution to what is called a law of chemical affinity, and matter is diversified, and enters into many combinations in advance of what was. The forces, of which light and heat, electricity and magnetism, are different forms, also expend themselves. Then there is a step up by the contribution of what was, to this end, and we have the first organic process, vegetable life and its forces. The soil under these influences gives vegetable life, giving up a part of itself for a higher end. The vegetable, in turn, gives itself for the animal, and the human soul finds these all in sacrificial contribution to itself, every one giving for that which is higher, to lead up to the highest. Nature is packed through and through with illustrations of this. Thus the worlds are built upon this law. By the law of sacrifice, the lower rises into that which is higher. So Christ taught us it is, and is to be, in the realm of the soul. He taught us by word, by deed, by example, that sacrifice is not only the highest, the most satisfying, the most exhaustive expression of love, but is God’s way for man to reach up to God. It was the climax of this law that found expression in the gift of Christ, and we but follow God’s law in Christ’s way, when we are ready to sacrifice lower good for higher good, to bring into contribution lesser things for greater things. And life rises to its highest when it is sacrificial in its self-abnegations; in its renunciations, when souls are uplifted into heroic sufferings and self denials. In wives for husbands, in husbands for wives, in parents for children, in patriotic soldiers, in Christian philanthropists. Men who incarnate their love in sacrifice rise by their giving. They reach to nobleness upon the “stepping-stone of their dead selves.” They put off earthiness and put on heavenliness. It is God’s law from lowest to highest. That which thou sowest is not quickened except it _die_. To give is to live. So we come to the Christian’s highest doctrine. It is that of the cross. We sing “In the cross of Christ we glory.” We accept it as the chief doctrine of our religion. We see the grandest exhibition of it when Christ gave himself for the sake of a greater good than could be if he did not give himself; and we teach that it is the personal reception of this which is _the_ mark of one who has a right to wear the name of Christ. To this doctrine the churches hold. Christians subscribe to it. We stoutly contend for it.