First, we find at the bottom of everything the Mineral or Inorganic Kingdom. Its characteristics are, first, that so far as the sphere above it is concerned it is dead; second, that although dead it furnishes the physical basis of life to the Kingdom next in order. It is thus absolutely essential to the Kingdom above it. And the more minutely the detailed structure and ordering of the whole fabric are investigated it becomes increasingly apparent that the Inorganic Kingdom is the preparation for, and the prophecy of, the Organic.

Second, we come to the world next in order, the world containing plant, and animal, and man, the Organic Kingdom. Its characteristics are, first, that so far as the sphere above it is concerned it is dead; and, second, although dead it supplies in turn the basis of life to the Kingdom next in order. And the more minutely the detailed structure and ordering of the whole fabric are investigated, it is obvious, in turn, that the Organic Kingdom is the preparation for, and the prophecy of the Spiritual.

Third, and highest, we reach the Spiritual Kingdom, or the Kingdom of Heaven. What its characteristics are, relatively to any hypothetical higher Kingdom, necessarily remain unknown. That the Spiritual, in turn, may be the preparation for, and the prophecy of, something still higher is not impossible. But the very conception of a Fourth Kingdom transcends us, and if it exists, the Spiritual organism, by the analogy, must remain at present wholly dead to it.

The warrant for adding this Third Kingdom consists, as just stated, in the fact that there are organisms which from their peculiar origin, nature, and destiny cannot be fitly entered in either of the two Kingdoms now known to science. The Second Kingdom is proclaimed by the advent upon the stage of the First, of once-born organisms. The Third is ushered in by the appearance, among these once-born organisms, of forms of life which have been born again—twice-born organisms. The classification, therefore, is based, from the scientific side on certain facts of embryology and on the Law of Biogenesis; and from the theological side on certain facts of experience and on the doctrine of Regeneration. To those who hold either to Biogenesis or to Regeneration, there is no escape from a Third Kingdom.[98]

There is in this conception of a high and spiritual organism rising out of the highest point of the Organic Kingdom, in the hypothesis of the Spiritual Kingdom itself, a Third Kingdom following the Second in sequence as orderly as the Second follows the First, a Kingdom utilizing the materials of both the Kingdoms beneath it, continuing their laws, and, above all, accounting for these lower Kingdoms in a legitimate way and complementing them in the only known way—there is in all this a suggestion of the greatest of modern scientific doctrines, the Evolution hypothesis, too impressive to pass unnoticed. The strength of the doctrine of Evolution, at least in its broader outlines, is now such that its verdict on any biological question is a consideration of moment. And if any further defence is needed for the idea of a Third Kingdom it may be found in the singular harmony of the whole conception with this great modern truth. It might even be asked whether a complete and consistent theory of Evolution does not really demand such a conception? Why should Evolution stop with the Organic? It is surely obvious that the complement of Evolution is Advolution, and the inquiry, Whence has all this system of things come, is, after all, of minor importance compared with the question, Whither does all this tend? Science, as such, may have little to say on such a question. And it is perhaps impossible, with such faculties as we now possess, to imagine an Evolution with a future as great as its past. So stupendous is the development from the atom to the man that no point can be fixed in the future as distant from what man is now as he is from the atom. But it has been given to Christianity to disclose the lines of a further Evolution. And if Science also professes to offer a further Evolution, not the most sanguine evolutionist will venture to contrast it, either as regards the dignity of its methods, the magnificence of its aims, or the certainty of its hopes, with the prospects of the Spiritual Kingdom. That Science has a prospect of some sort to hold out to man, is not denied. But its limits are already marked. Mr. Herbert Spencer, after investigating its possibilities fully, tells us, "Evolution has an impassable limit."[99] It is the distinct claim of the Third Kingdom that this limit is not final. Christianity opens a way to a further development—a development apart from which the magnificent past of Nature has been in vain, and without which Organic Evolution, in spite of the elaborateness of its processes and the vastness of its achievements, is simply a stupendous cul de sac. Far as nature carries on the task, vast as is the distance between the atom and the man, she has to lay down her tools when the work is just begun. Man, her most rich and finished product, marvelous in his complexity, all but Divine in sensibility, is to the Third Kingdom not even a shapeless embryo. The old chain of processes must begin again on the higher plane if there is to be a further Evolution. The highest organism of the Second Kingdom—simple, immobile, dead as the inorganic crystal, toward the sphere above—must be vitalized afresh. Then from a mass of all but homogeneous "protoplasm" the organism must pass through all the stages of differentiation and integration, growing in perfectness and beauty under the unfolding of the higher Evolution, until it reaches the Infinite Complexity, the Infinite Sensibility, God. So the spiritual carries on the marvelous process to which all lower Nature ministers, and perfects it when the ministry of lower Nature fails.

This conception of a further Evolution carries with it the final answer to the charge that, as regards morality, the Spiritual world has nothing to offer man that is not already within his reach. Will it be contended that a perfect morality is already within the reach of the natural man? What product of the organic creation has ever attained to the fullness of the stature of Him who is the Founder and Type of the Spiritual Kingdom? What do men know of the qualities enjoined in His Beatitudes, or at what value do they estimate them? Proved by results, it is surely already decided that on merely natural lines moral perfection is unattainable. And even Science is beginning to awaken to the momentous truth that Man, the highest product of the Organic Kingdom, is a disappointment. But even were it otherwise, if even in prospect the hopes of the Organic Kingdom could be justified, its standard of beauty is not so high, nor, in spite of the dreams of Evolution, is its guarantee so certain. The goal of the organisms of the Spiritual World is nothing less than this—to be "holy as He is holy, and pure as He is pure." And by the Law of Conformity to Type, their final perfection is secured. The inward nature must develop out according to its Type, until the consummation of oneness with God is reached.

These proposals of the Spiritual Kingdom in the direction of Evolution are at least entitled to be carefully considered by Science. Christianity defines the highest conceivable future for mankind. It satisfies the Law of Continuity. It guarantees the necessary conditions for carrying on the organism successfully, from stage to stage. It provides against the tendency to Degeneration. And finally, instead of limiting the yearning hope of final perfection to the organisms of a future age—an age so remote that the hope for thousands of years must still be hopeless—instead of inflicting this cruelty on intelligences mature enough to know perfection and earnest enough to wish it, Christianity puts the prize within immediate reach of man.

This attempt to incorporate the Spiritual Kingdom in the scheme of Evolution, may be met by what seems at first sight a fatal objection. So far from the idea of a Spiritual Kingdom being in harmony with the doctrine of Evolution, it may be said that it is violently opposed to it. It announces a new Kingdom starting off suddenly on a different plane and in direct violation of the primary principle of development. Instead of carrying the organic evolution further on its own lines, theology at a given point interposes a sudden and hopeless barrier—the barrier between the natural and the spiritual—and insists that the evolutionary process must begin again at the beginning. At this point, in fact, Nature acts per saltum. This is no Evolution, but a Catastrophe—such a Catastrophe as must be fatal to any consistent development hypothesis.

On the surface this objection seems final—but it is only on the surface. It arises from taking a too narrow view of what Evolution is. It takes evolution in zoology for Evolution as a whole. Evolution began, let us say, with some primeval nebulous mass in which lay potentially all future worlds. Under the evolutionary hand, the amorphous cloud broke up, condensed, took definite shape, and in the line of true development assumed a gradually increasing complexity. Finally there emerged the cooled and finished earth, highly differentiated, so to speak, complete and fully equipped. And what followed? Let it be well observed—a Catastrophe. Instead of carrying the process further, the Evolution, if this is Evolution, here also abruptly stops. A sudden and hopeless barrier—the barrier between the Inorganic and the Organic—interposes, and the process has to begin again at the beginning with the creation of Life. Here then is a barrier placed by Science at the close of the Inorganic similar to the barrier placed by Theology at the close of the Organic. Science has used every effort to abolish this first barrier, but there it still stands challenging the attention of the modern world, and no consistent theory of Evolution can fail to reckon with it. Any objection, then, to the Catastrophe introduced by Christianity between the Natural and Spiritual Kingdoms applies with equal force against the barrier which Science places between the Inorganic and the Organic. The reserve of Life in either case is a fact, and a fact of exceptional significance.

What then becomes of Evolution? Do these two great barriers destroy it? By no means. But they make it necessary to frame a larger doctrine. And the doctrine gains immeasurably by such an enlargement. For now the case stands thus: Evolution, in harmony with its own law that progress is from the simple to the complex, begins itself to pass toward the complex. The materialistic Evolution, so to speak, is a straight line. Making all else complex, it alone remains simple—unscientifically simple. But, as Evolution unfolds everything else, it is now seen to be itself slowly unfolding. The straight line is coming out gradually in curves. At a given point a new force appears deflecting it; and at another given point a new force appears deflecting that. These points are not unrelated points; these forces are not unrelated forces. The arrangement is still harmonious, and the development throughout obeys the evolutionary law in being from the general to the special, from the lower to the higher. What we are reaching, in short, is nothing less than the evolution of Evolution.