The sciences referred to certify further, that as regards the various forms of life there has been from the time when it can be first traced to the present day "advance and progress in the main," and that the history of the earth corresponds throughout with the history of life on the earth, while each age prepares for the coming of another better than itself. But advance and progress presuppose intelligence, because they cannot be rationally conceived of apart from an ideal goal foreseen and selected. Volumes might be written to show how subtly and accurately external nature is adjusted to the requirements of vegetable and animal life, and how vegetable and animal life are inter-related; nay, even on how well the earth is fitted for the development and happiness of man. Think of the innumerable points of contact and connection, for example, between physical geography and political economy, which all indicate so many harmonies between the earth and man's economical condition, capacities, and history.[24]
The vegetable and animal kingdoms viewed generally, are also striking instances of unity of plan, of progressive order, of elaborately adjusted system. There are general principles of structure and general laws of development common to all organisms, constituting a plan of organisation capable of almost infinite variation, which underlies all the genera and orders of living creatures, vegetable and animal. It comprehends a number of subordinate plans which involve very abstract conceptions, and which even the ablest naturalists still very imperfectly comprehend. These higher plans would probably never have been thought of but for the detection of the numerous phenomena which seemed on a superficial view irreconcilable with the idea of purpose in creation. Just as it was those so-called "disturbances" in the planetary orbits, which appeared at first to point to some disorder and error in the construction of the sidereal system, that prompted Lagrange to the investigations which resulted in establishing that the order of the heavens was of a sublimer and more remarkable character than had been imagined, essentially including these apparent disturbances, so it has been the seeming exceptions to plan which are witnessed in rudimentary and aborted organs (such as the wing-bones in wingless birds, the finger-bones in horses, the legs below the skin in serpents, the teeth which never cut the gums in whales, &c.), that have indicated to modern biologists a unity of organisation far more comprehensive and wonderful than had previously been suspected. The larger and more ideal order thus brought to light as ruling in the organic world is one which could only have originated in a mind of unspeakable power and perfection. And it not only thus testifies directly of itself in favour of a Divine Intelligence, but the recognition of it, while correcting in some respects earlier conceptions as to the place of utility in nature, far from proving that utility has been disregarded or sacrificed, shows that each organ has been formed, not only with reference to its actual use in a given individual or species, but to the capacity of being applied to use in countless other individuals and species.[25]
When we enter into the examination of organisation in itself, adjustment becomes still more obvious in the processes of growth, reproduction, fructification, &c., in plants and animals, and in the provisions for locomotion, for securing food and shelter, for sight, hearing, &c., in the latter. The great physician, Sir Charles Bell, devoted a whole treatise to point out those which are to be found in the hand alone. The arrangement of bones, muscles, joints, and other parts in the limb of a tiger or the wing of an eagle are not less admirable. The eye and ear are singularly exquisite structures, the former being far the most perfect of optical, and the latter far the most perfect of acoustic instruments. Instances of this sort are, indeed, so remarkable, and so irresistibly convincing to most minds, that some theists have consented to rest on them exclusively the inference of a designing intelligence. They would grant that the evidences of purpose are only to be traced in organisation. The limitation is inconsistent and untenable, but not inexplicable. The adjustment of parts to one another, and their co-ordination as means to an end, are not more certainly existent in fitting the eye to see and the ear to hear than in securing the stability of the solar system, but they are more obviously visible because compressed into a compass easily grasped and surveyed; because organ and function are the most specialised kinds of means and ends; because organisms are the most curiously and conspicuously elaborate examples of order. And as the telescope can show us no end of the simple and majestic order of the heavens, so the microscope can show us no end of the exquisite and impressive order which discloses even—
"In Nature's most minute design,
The signature and stamp of power divine;
Contrivance intricate, expressed with ease,
Where unassisted sight no beauty sees.
The shapely limb and lubricated joint
Within the small dimensions of a point;
Muscle and nerve miraculously spun,
His mighty work, who speaks and it is done.
The Invisible, in things scarce seen revealed,
To whom an atom is an ample field."—(Cowper.)[26]
The traces of a Supreme Reason crowd still more upon the vision when we come to the human mind,—
"The varied scene of quick-compounded thought,
And where the mixing passions endless shift."
—(Thomson.)
The mere existence of originated minds necessarily implies the existence of an unoriginated mind. "What can be more absurd," asks Montesquieu, "than to imagine that a blind fatalistic force has produced intelligent beings?" The complicated and refined adjustments of the body to the mind, and of the mind to the body, are so numerous and interesting that their study has now become the task of a special class of scientific men. A very little disorder in the organisation of the brain—such as even microscopic post-mortem examination may fail to detect—suffices to cause hallucinations of the senses, to shake intellect from its throne, to paralyse the will, and to corrupt the sentiments and affections. How precise and skilful must the adjustment be between the sound brain and sane mind! Who sufficiently realises the mystery of wisdom which lies in the familiar fact that the mind, by merely willing to use the members of the body, sets in motion instantaneously and unconsciously, without effort and without failure, cords and pulleys and levers, joints and muscles, of which it only vaguely, if at all, surmises the existence? The laws of our various appetencies, affections, and emotions, and their relations to their special ends or objects, the nature of the several intellectual faculties and their subservience to mental culture, and still more the general constitution of the mind as a system consisting of a multitude of powers under the government of reason and conscience, present to us vast fields filled with the evidences of Divine Wisdom.[27]
There are others no less extensive and inexhaustible in the principles which underlie and maintain human society, and those which preside over the progressive development of humanity. Political economy is the department of social science which has been cultivated with most success. What, then, is its most comprehensive and best established theorem? This—that although the great majority of men are moved mainly by self-interest, and few seek with much zeal or persistency the general good, the result of their being left in perfect freedom to pursue their own advantage, so long as they do not outwardly violate the rules of justice, is far better for the whole society than if they conformed their conduct to any plan which human wisdom, aiming directly at the general good, could devise; nature having provided in the principles of the human constitution and the circumstances of human life for the selfish plans and passions of individuals so neutralising one another, so counteracting and counterpoising one another, as to secure the social stability and welfare—as to leave general ideas and interests to rule with comparatively little resistance. It is surely a natural inference from this that a Supreme Reason grasps all human reasons, and uses them in order to realise a purpose grander and better than any which they themselves contemplate. History viewed as a whole teaches the same truth on a wider scale. An examination of it discloses a plan pervading human affairs from the origin of man until the present day—a progress which has proceeded without break or stoppage, in accordance with laws which are as yet very imperfectly apprehended. Of the countless generations which have come and gone like the leaves of the forest, for unknown thousands of years, few have had the slightest glimpse of the order which connected them with their fellows, and embraced their every action; fewer still have sought to conform to it; the immense majority have set before them only mean and narrow schemes for personal good; all passions have raged and all vices prevailed in their turn; there have been confusion and tumult and war; and yet the order, progress, plan I speak of have been slowly and silently but surely built up. In this evolution of order out of the chaos of millions on millions of conflicting human wills seeking merely their own pleasure, there is, perhaps, even a more impressive proof of the operation of Divine Wisdom than in the origination and preservation of order among the multitudinous stars of heaven. The philosophical historian who has most conclusively shown by the scrutiny of the chief events in the annals of humanity the existence of such a progressive plan, is amply justified in arguing that it cannot have originated with man, or matter, or chance, but must be the work of God. "We have passed in review," he says, "all the theories imagined by philosophers and historians to explain the mysterious fact that there is in the life of man unfolded in history a succession, a plan, a development, which cannot be referred to man himself. Some, despairing from the outset to find a solution, make of their ignorance a blind power which they call hazard. Evidently that is no solution. Hazard is a word, and nothing more. Other writers—the majority of writers—say that this mysterious power is nature, under the form of climate, or races, or the whole of the physical influences which act on the moral world. But what is nature? Whence has it this power, this foresight, this intelligence, which are so conspicuous in the course of our destinies? If nature is matter, and nothing but matter, that too is no answer. Who will believe that matter acts with wisdom—with intelligence? Where there is intelligent action there must be an intelligent being; therefore nature leads us to God. Finally, there are those who substitute for nature general laws. But do not laws suppose a legislator? and who can this legislator be, if not God?"[28]
There is, then, everywhere, both in the physical and moral worlds, order and adaptation, proportion and co-ordination, and there is very widely present progress—order which advances in a certain direction to a certain end, which is until realised only an ideal. This is the state of things which science discloses. The question is, Is this state of things intelligible on any other supposition than that of a designing mind? The theist holds that it is not; that it directly and imperatively demands an intelligent cause; that to assign it either to no cause, or to any other than an intelligent cause, is, in the strictest and strongest sense of the term, absurd. If we deny that there is such order as I have indicated, we set aside the entire teaching of all the sciences—we pronounce science to be from beginning to end a delusion and a lie. Men in the present day dare not do this. If we deny that such order implies the agency of a Supreme Intelligence, we contradict no express declaration of any of the sciences; we may accept all that they have to tell us about order, and they can tell us about nothing else. But notwithstanding this, it is far more reasonable, far less absurd, to deny that there is order in the universe, than to admit it and deny that its ultimate cause is an intelligence. Further, although we cannot be more certain of the cause than of the effect from which it is inferred, and consequently cannot be more certain that an intelligence has produced the order which is in the universe than that there is order therein, the theistic inference from the whole of that order may well be greatly stronger than the scientific proof of order in any particular instance. Men of science have probably never as good reasons for believing in the laws of order brought to light by their own special science, as the theist has for believing in a Supreme Intelligence because of the order which is the common and concurrent result of all the sciences, and which is obvious to every eye.