As the reasons, therefore, for the constancy of the laws of nature seem, even to our understandings, obvious and striking; if we return to the principle of population and consider man as he really is, inert, sluggish, and averse from labour, unless compelled by necessity (and it is surely the height of folly to talk of man, according to our crude fancies of what he might be), we may pronounce with certainty that the world would not have been peopled, but for the superiority of the power of population to the means of subsistence. Strong and constantly operative as this stimulus is on man to urge him to the cultivation of the earth, if we still see that cultivation proceeds very slowly, we may fairly conclude that a less stimulus would have been insufficient. Even under the operation of this constant excitement, savages will inhabit countries of the greatest natural fertility for a long period before they betake themselves to pasturage or agriculture. Had population and food increased in the same ratio, it is probable that man might never have emerged from the savage state. But supposing the earth once well peopled, an Alexander, a Julius Caesar, a Tamberlane, or a bloody revolution might irrecoverably thin the human race, and defeat the great designs of the Creator. The ravages of a contagious disorder would be felt for ages; and an earthquake might unpeople a region for ever. The principle, according to which population increases, prevents the vices of mankind, or the accidents of nature, the partial evils arising from general laws, from obstructing the high purpose of the creation. It keeps the inhabitants of the earth always fully up to the level of the means of subsistence; and is constantly acting upon man as a powerful stumulus, urging him to the further cultivation of the earth, and to enable it, consequently, to support a more extended population. But it is impossible that this law can operate, and produce the effects apparently intended by the Supreme Being, without occasioning partial evil. Unless the principle of population were to be altered according to the circumstances of each separate country (which would not only be contrary to our universal experience, with regard to the laws of nature, but would contradict even our own reason, which sees the absolute necessity of general laws for the formation of intellect), it is evident that the same principle which, seconded by industry, will people a fertile region in a few years must produce distress in countries that have been long inhabited.
It seems, however, every way probable that even the acknowledged difficulties occasioned by the law of population tend rather to promote than impede the general purpose of Providence. They excite universal exertion and contribute to that infinite variety of situations, and consequently of impressions, which seems upon the whole favourable to the growth of mind. It is probable, that too great or too little excitement, extreme poverty, or too great riches may be alike unfavourable in this respect. The middle regions of society seem to be best suited to intellectual improvement, but it is contrary to the analogy of all nature to expect that the whole of society can be a middle region. The temperate zones of the earth seem to be the most favourable to the mental and corporal energies of man, but all cannot be temperate zones. A world, warmed and enlightened but by one sun, must from the laws of matter have some parts chilled by perpetual frosts and others scorched by perpetual heats. Every piece of matter lying on a surface must have an upper and an under side, all the particles cannot be in the middle. The most valuable parts of an oak, to a timber merchant, are not either the roots or the branches, but these are absolutely necessary to the existence of the middle part, or stem, which is the object in request. The timber merchant could not possibly expect to make an oak grow without roots or branches, but if he could find out a mode of cultivation which would cause more of the substance to go to stem, and less to root and branch, he would be right to exert himself in bringing such a system into general use.
In the same manner, though we cannot possibly expect to exclude riches and poverty from society, yet if we could find out a mode of government by which the numbers in the extreme regions would be lessened and the numbers in the middle regions increased, it would be undoubtedly our duty to adopt it. It is not, however, improbable that as in the oak, the roots and branches could not be diminished very greatly without weakening the vigorous circulation of the sap in the stem, so in society the extreme parts could not be diminished beyond a certain degree without lessening that animated exertion throughout the middle parts, which is the very cause that they are the most favourable to the growth of intellect. If no man could hope to rise or fear to fall, in society, if industry did not bring with it its reward and idleness its punishment, the middle parts would not certainly be what they now are. In reasoning upon this subject, it is evident that we ought to consider chiefly the mass of mankind and not individual instances. There are undoubtedly many minds, and there ought to be many, according to the chances out of so great a mass, that, having been vivified early by a peculiar course of excitements, would not need the constant action of narrow motives to continue them in activity. But if we were to review the various useful discoveries, the valuable writings, and other laudable exertions of mankind, I believe we should find that more were to be attributed to the narrow motives that operate upon the many than to the apparently more enlarged motives that operate upon the few.
Leisure is, without doubt, highly valuable to man, but taking man as he is, the probability seems to be that in the greater number of instances it will produce evil rather than good. It has been not infrequently remarked that talents are more common among younger brothers than among elder brothers, but it can scarcely be imagined that younger brothers are, upon an average, born with a greater original susceptibility of parts. The difference, if there really is any observable difference, can only arise from their different situations. Exertion and activity are in general absolutely necessary in one case and are only optional in the other.
That the difficulties of life contribute to generate talents, every day's experience must convince us. The exertions that men find it necessary to make, in order to support themselves or families, frequently awaken faculties that might otherwise have lain for ever dormant, and it has been commonly remarked that new and extraordinary situations generally create minds adequate to grapple with the difficulties in which they are involved.
