An Essay on the Principle of Population

by T. R. Malthus

Mr Godwin says, 'Nothing can be more unphilosophical than to conclude, that, because a certain species of power is beyond the train of our present observation, that it is beyond the limits of the human mind.' I own my ideas of philosophy are in this respect widely different from Mr Godwin's. The only distinction that I see, between a philosophical conjecture, and the assertions of the Prophet Mr Brothers, is, that one is founded upon indications arising from the train of our present observations, and the other has no foundation at all. I expect that great discoveries are yet to take place in all the branches of human science, particularly in physics; but the moment we leave past experience as the foundation of our conjectures concerning the future, and, still more, if our conjectures absolutely contradict past experience, we are thrown upon a wide field of uncertainty, and any one supposition is then just as good as another. If a person were to tell me that men would ultimately have eyes and hands behind them as well as before them, I should admit the usefulness of the addition, but should give as a reason for my disbelief of it, that I saw no indications whatever in the past from which I could infer the smallest probability of such a change. If this be not allowed a valid objection, all conjectures are alike, and all equally philosophical. I own it appears to me that in the train of our present observations, there are no more genuine indications that man will become immortal upon earth than that he will have four eyes and four hands, or that trees will grow horizontally instead of perpendicularly.

It will be said, perhaps, that many discoveries have already taken place in the world that were totally unforeseen and unexpected. This I grant to be true; but if a person had predicted these discoveries without being guided by any analogies or indications from past facts, he would deserve the name of seer or prophet, but not of philosopher. The wonder that some of our modern discoveries would excite in the savage inhabitants of Europe in the times of Theseus and Achilles, proves but little. Persons almost entirely unacquainted with the powers of a machine cannot be expected to guess at its effects. I am far from saying, that we are at present by any means fully acquainted with the powers of the human mind; but we certainly know more of this instrument than was known four thousand years ago; and therefore, though not to be called competent judges, we are certainly much better able than savages to say what is, or is not, within its grasp. A watch would strike a savage with as much surprise as a perpetual motion; yet one is to us a most familiar piece of mechanism, and the other has constantly eluded the efforts of the most acute intellects. In many instances we are now able to perceive the causes, which prevent an unlimited improvement in those inventions, which seemed to promise fairly for it at first. The original improvers of telescopes would probably think, that as long as the size of the specula and the length of the tubes could be increased, the powers and advantages of the instrument would increase; but experience has since taught us, that the smallness of the field, the deficiency of light, and the circumstance of the atmosphere being magnified, prevent the beneficial results that were to be expected from telescopes of extraordinary size and power. In many parts of knowledge, man has been almost constantly making some progress; in other parts, his efforts have been invariably baffled. The savage would not probably be able to guess at the causes of this mighty difference. Our further experience has given us some little insight into these causes, and has therefore enabled us better to judge, if not of what we are to expect in future, at least of what we are not to expect, which, though negative, is a very useful piece of information.

As the necessity of sleep seems rather to depend upon the body than the mind, it does not appear how the improvement of the mind can tend very greatly to supersede this 'conspicuous infirmity'. A man who by great excitements on his mind is able to pass two or three nights without sleep, proportionably exhausts the vigour of his body, and this diminution of health and strength will soon disturb the operations of his understanding, so that by these great efforts he appears to have made no real progress whatever in superseding the necessity of this species of rest.

There is certainly a sufficiently marked difference in the various characters of which we have some knowledge, relative to the energies of their minds, their benevolent pursuits, etc., to enable us to judge whether the operations of intellect have any decided effect in prolonging the duration of human life. It is certain that no decided effect of this kind has yet been observed. Though no attention of any kind has ever produced such an effect as could be construed into the smallest semblance of an approach towards immortality, yet of the two, a certain attention to the body seems to have more effect in this respect than an attention to the mind. The man who takes his temperate meals and his bodily exercise, with scrupulous regularity, will generally be found more healthy than the man who, very deeply engaged in intellectual pursuits, often forgets for a time these bodily cravings. The citizen who has retired, and whose ideas, perhaps, scarcely soar above or extend beyond his little garden, puddling all the morning about his borders of box, will, perhaps, live as long as the philosopher whose range of intellect is the most extensive, and whose views are the clearest of any of his contemporaries. It has been positively observed by those who have attended to the bills of mortality that women live longer upon an average than men, and, though I would not by any means say that their intellectual faculties are inferior, yet, I think, it must be allowed that, from their different education, there are not so many women as men, who are excited to vigorous mental exertion.

As in these and similar instances, or to take a larger range, as in the great diversity of characters that have existed during some thousand years, no decided difference has been observed in the duration of human life from the operation of intellect, the mortality of man on earth seems to be as completely established, and exactly upon the same grounds, as any one, the most constant, of the laws of nature. An immediate act of power in the Creator of the Universe might, indeed, change one or all of these laws, either suddenly or gradually, but without some indications of such a change, and such indications do not exist, it. Is just as unphilosophical to suppose that the life of man may be prolonged beyond any assignable limits, as to suppose that the attraction of the earth will gradually be changed into repulsion and that stones will ultimately rise instead of fall or that the earth will fly off at a certain period to some more genial and warmer sun.

The conclusion of this chapter presents us, undoubtedly, with a very beautiful and desirable picture, but like some of the landscapes drawn from fancy and not imagined with truth, it fails of that interest in the heart which nature and probability can alone give.

I cannot quit this subject without taking notice of these conjectures of Mr Godwin and Mr Condorcet concerning the indefinite prolongation of human life, as a very curious instance of the longing of the soul after immortality. Both these gentlemen have rejected the light of revelation which absolutely promises eternal life in another state. They have also rejected the light of natural religion, which to the ablest intellects in all ages has indicated the future existence of the soul. Yet so congenial is the idea of immortality to the mind of man that they cannot consent entirely to throw it out of their systems. After all their fastidious scepticisms concerning the only probable mode of immortality, they introduce a species of immortality of their own, not only completely contradictory to every law of philosophical probability, but in itself in the highest degree narrow, partial, and unjust. They suppose that all the great, virtuous, and exalted minds that have ever existed or that may exist for some thousands, perhaps millions of years, will be sunk in annihilation, and that only a few beings, not greater in number than can exist at once upon the earth, will be ultimately crowned with immortality. Had such a tenet been advanced as a tenet of revelation I am very sure that all the enemies of religion, and probably Mr Godwin and Mr Condorcet among the rest, would have exhausted the whole force of their ridicule upon it, as the most puerile, the most absurd, the poorest, the most pitiful, the most iniquitously unjust, and, consequently, the most unworthy of the Deity that the superstitious folly of man could invent.

What a strange and curious proof do these conjectures exhibit of the inconsistency of scepticism! For it should be observed, that there is a very striking and essential difference between believing an assertion which absolutely contradicts the most uniform experience, and an assertion which contradicts nothing, but is merely beyond the power of our present observation and knowledge. So diversified are the natural objects around us, so many instances of mighty power daily offer themselves to our view, that we may fairly presume, that there are many forms and operations of nature which we have not yet observed, or which, perhaps, we are not capable of observing with our present confined inlets of knowledge. The resurrection of a spiritual body from a natural body does not appear in itself a more wonderful instance of power than the germination of a blade of wheat from the grain, or of an oak from an acorn. Could we conceive an intelligent being, so placed as to be conversant only with inanimate or full grown objects, and never to have witnessed the process of vegetation and growth; and were another being to shew him two little pieces of matter, a grain of wheat, and an acorn, to desire him to examine them, to analyse them if he pleased, and endeavour to find out their properties and essences; and then to tell him, that however trifling these little bits of matter might appear to him, that they possessed such curious powers of selection, combination, arrangement, and almost of creation, that upon being put into the ground, they would choose, amongst all the dirt and moisture that surrounded them, those parts which best suited their purpose, that they would collect and arrange these parts with wonderful taste, judgement, and execution, and would rise up into beautiful forms, scarcely in any respect analogous to the little bits of matter which were first placed in the earth. I feel very little doubt that the imaginary being which I have supposed would hesitate more, would require better authority, and stronger proofs, before he believed these strange assertions, than if he had been told, that a being of mighty power, who had been the cause of all that he saw around him, and of that existence of which he himself was conscious, would, by a great act of power upon the death and corruption of human creatures, raise up the essence of thought in an incorporeal, or at least invisible form, to give it a happier existence in another state.

The only difference, with regard to our own apprehensions, that is not in favour of the latter assertion is that the first miracle we have repeatedly seen, and the last miracle we have not seen. I admit the full weight of this prodigious difference, but surely no man can hesitate a moment in saying that, putting Revelation out of the question, the resurrection of a spiritual body from a natural body, which may be merely one among the many operations of nature which we cannot see, is an event indefinitely more probable than the immortality of man on earth, which is not only an event of which no symptoms or indications have yet appeared, but is a positive contradiction to one of the most constant of the laws of nature that has ever come within the observation of man.

When we extend our view beyond this life, it is evident that we can have no other guides than authority, or conjecture, and perhaps, indeed, an obscure and undefined feeling. What I say here, therefore, does not appear to me in any respect to contradict what I said before, when I observed that it was unphilosophical to expect any specifick event that was not indicated by some kind of analogy in the past. In ranging beyond the bourne from which no traveller returns, we must necessarily quit this rule; but with regard to events that may be expected to happen on earth, we can seldom quit it consistently with true philosophy. Analogy has, however, as I conceive, great latitude. For instance, man has discovered many of the laws of nature: analogy seems to indicate that he will discover many more; but no analogy seems to indicate that he will discover a sixth sense, or a new species of power in the human mind, entirely beyond the train of our present observations.