In all these cases, stimulants upon the mind seem to act rather by taking off the attention from the bodily fatigue, than by really and truly counteracting it. If the energy of my mind had really counteracted the fatigue of my body, why should I feel tired the next morning? if the stimulus of the hounds had as completely overcome the fatigue of the journey in reality, as it did in appearance, why should the horse be tired sooner than if he had not gone the forty miles? I happen to have a very bad fit of the toothache at the time I am writing this. In the eagerness of composition, I every now and then, for a moment or two, forget it. Yet I cannot help thinking that the process, which causes the pain, is still going forwards, and that the nerves which carry the information of it to the brain are even during these moments demanding attention and room for their appropriate vibrations.
The multiplicity of vibrations of another kind may perhaps prevent their admission, or overcome them for a time when admitted, till a shoot of extraordinary energy puts all other vibration to the rout, destroys the vividness of my argumentative conceptions, and rides triumphant in the brain. In this case, as in the others, the mind seems to have little or no power in counteracting or curing the disorder, but merely possesses a power, if strongly excited, of fixing its attention on other subjects.
I do not, however, mean to say that a sound and vigorous mind has no tendency whatever to keep the body in a similar state. So close and intimate is the union of mind and body that it would be highly extraordinary if they did not mutually assist each other's functions. But, perhaps, upon a comparison, the body has more effect upon the mind than the mind upon the body. The first object of the mind is to act as purveyor to the wants of the body. When these wants are completely satisfied, an active mind is indeed apt to wander further, to range over the fields of science, or sport in the regions of. Imagination, to fancy that it has 'shuffled off this mortal coil', and is seeking its kindred element. But all these efforts are like the vain exertions of the hare in the fable. The slowly moving tortoise, the body, never fails to overtake the mind, however widely and extensively it may have ranged, and the brightest and most energetic intellects, unwillingly as they may attend to the first or second summons, must ultimately yield the empire of the brain to the calls of hunger, or sink with the exhausted body in sleep.
It seems as if one might say with certainty that if a medicine could be found to immortalize the body there would be no fear of its [not] being accompanied by the immortality of the mind. But the immortality of the mind by no means seems to infer the immortality of the body. On the contrary, the greatest conceivable energy of mind would probably exhaust and destroy the strength of the body. A temperate vigour of mind appears to be favourable to health, but very great intellectual exertions tend rather, as has been often observed, to wear out the scabbard.
Most of the instances which Mr Godwin has brought to prove the power of the mind over the body, and the consequent probability of the immortality of man, are of this latter description, and could such stimulants be continually applied, instead of tending to immortalize, they would tend very rapidly to destroy the human frame.
The probable increase of the voluntary power of man over his animal frame comes next under Mr Godwin's consideration, and he concludes by saying, that the voluntary power of some men, in this respect, is found to extend to various articles in which other men are impotent. But this is reasoning against an almost universal rule from a few exceptions; and these exceptions seem to be rather tricks, than powers that may be exerted to any good purpose. I have never heard of any man who could regulate his pulse in a fever, and doubt much, if any of the persons here alluded to have made the smallest perceptible progress in the regular correction of the disorders of their frames and the consequent prolongation of their lives.
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 Isee, 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.
