"It is true, I say, 'That bodies operate by impulse, and nothing else,' and so I thought when I writ it, and can yet conceive no other way of their operation. But I am since convinced, by the judicious Mr. Newton's incomparable book, that it is too bold a presumption to limit God's power in this point by my narrow conceptions. The gravitation of matter towards matter, by way unconceivable to me, is not only a demonstration that God can, if He pleases, put into bodies powers and ways of operation above what can be derived from our idea of body, or can be explained by what we know of matter, but also an unquestionable and everywhere visible instance that He has done so. And therefore, in the next edition of my book, I will take care to have that passage rectified....
"As to self-consciousness, your lordship asks, 'What is there like self-consciousness in matter?' Nothing at all in matter as matter. But that God cannot bestow on some parcels of matter a power of thinking, and with it self-consciousness, will never be proved by asking how is it possible to apprehend that mere body should perceive that it doth perceive? The weakness of our apprehension I grant in the case: I confess as much as you please, that we cannot conceive how an unsolid created substance thinks; but this weakness of our apprehension reaches not the power of God, whose weakness is stronger than anything in man."
Lastly, Locke turns upon his opponent the power of the odium theologicum.
"Let it be as hard a matter as it will to give an account what it is that should keep the parts of a material soul together after it is separated from the body, yet it will be always as easy to give an account of it as to give an account what it is that shall keep together a material and immaterial substance. And yet the difficulty that there is to give an account of that, I hope, does not, with your lordship, weaken the credibility of the inseparable union of soul and body to eternity; and I persuade myself that the men of sense, to whom your lordship appeals in this case, do not find their belief of this fundamental point much weakened by that difficulty.... But you will say, you speak only of the soul; and your words are, that it is no easy matter to give an account how the soul should be capable of immortality unless it be a material substance. I grant it, but crave leave to say, that there is not any one of these difficulties that are or can be raised about the manner how a material soul can be immortal, which do not as well reach the immortality of the body....
"But your lordship, as I guess from your following words, would argue that a material substance cannot be a free agent; whereby I suppose you only mean that you cannot see or conceive how a solid substance should begin, stop, or change its own motion. To which give me leave to answer, that when you can make it conceivable how any created, finite, dependent substance can move itself, I suppose you will find it no harder for God to bestow this power on a solid than an unsolid created substance.... But though you cannot see how any created substance, solid or not solid, can be a free agent (pardon me, my lord, if I put in both, till your lordship please to explain it of either, and show the manner how either of them can of itself move itself or anything else), yet I do not think you will so far deny men to be free agents, from the difficulty there is to see how they are free agents, as to doubt whether there be foundation enough for the day of judgment."
Let us now, for the sake of contrast, turn to some passages which occur in the other train of reasoning.
"If we suppose only matter and motion first or eternal, thought can never begin to be. For it is impossible to conceive that matter, either with or without motion, could have originally in and from itself sense, perception, and knowledge; as is evident from hence, that then sense, perception, and knowledge must be a property eternally inseparable from matter and every particle of it." There is a double fallacy here. In the first place, conceivability is made the unconditional test of possibility; and, in the next place, it is asserted that unless every particle of matter can think, no collocation of such particles can possibly do so. This latter fallacy is further insisted upon thus:—"If they will not allow matter as matter, that is, every particle of matter, to be as well cogitative as extended, they will have as hard a task to make out to their own reasons a cogitative being out of incogitative particles, as an extended being out of unextended parts, if I may so speak.... Every particle of matter, as matter, is capable of all the same figures and motions of any other, and I challenge any one in his thoughts to add anything else to one above another." Now, as we have seen, Locke himself has shown in his other trains of argument that this challenge is thoroughly futile as a refutation of possibilities; but the point to which I now wish to draw attention is this—It does not follow because certain and highly complex collocations of material particles may be supposed capable of thinking, that therefore every particle of matter must be regarded as having this attribute. We have innumerable analogies in nature of a certain collocation of matter and force producing certain results which another somewhat similar collocation could not produce: in such cases we do not assume that all the resulting attributes of the one collocation must be presented also by the other—still less that these resulting attributes must belong to the primary qualities of matter and force. Hence, it is not fair to assume that thought must either be inherent in every particle of matter, or else not producible by any possible collocation of such particles, unless it has previously been shown that so to produce it by any possible collocation is in the nature of things impossible. But no one could refute this fallacy better than Locke himself has done in some of the passages already quoted from his other train of reasoning.
But to continue the quotation:—"If, therefore, it be evident that something necessarily must exist from eternity, it is also as evident that that something must necessarily be a cogitative being; for it is as impossible [inconceivable] that incogitative matter should produce a cogitative being, as that nothing, or the negation of all being, should produce a positive being or matter." Again,—"For unthinking particles of matter, however put together, can have [can be taught to have] nothing thereby added to them, but a new relation of position, which it is impossible [inconceivable] should give thought and knowledge to them."
It is unnecessary to multiply these quotations, for, in effect, they would all be merely repetitions of one another. It is enough to have seen that this able author undertakes to demonstrate the existence of a God, and that his whole demonstration resolves itself into the unwarrantable inference, that as we are unable to conceive how thought can be a property of matter, therefore a property of matter thought cannot be. That such an erroneous inference should occur in any writings of so old a date as those of Locke is not in itself surprising. What is surprising is the fact, that in the same writings, and in the course of the same discussion, the fallacy of this very inference is repeatedly pointed out and insisted upon in a great variety of ways; and it has been chiefly for the sake of showing the pernicious influence which preformed opinion may exert—viz., even to blinding the eyes of one of the most clear-sighted and thoughtful men that ever lived to a glaring contradiction repeated over and over again in the course of a few pages,—it has been chiefly for this reason that I have extended this Appendix to so great a length. I shall now conclude it by quoting some sentences which occur on the very next page after that from which the last quoted sentences were taken. Our author here again returns to his defence of the omnipotency of God; and as he now again thus personifies the sum total of possibility, his mind abruptly reverts to all its other class of associations. In this case the transition is particularly interesting, not only on account of its suddenness, but also because the correlations contemplated happen to be exactly the same in the two cases—viz., matter as the cause of mind, and mind as the cause of matter. Remember that on the last page this great philosopher supposed he had demonstrated the abstract impossibility of matter being the cause of mind on the ground of a causal connection being inconceivable, let us now observe what he says upon this page regarding the abstract possibility of mind being the cause of matter. "Nay, possibly, if we would emancipate ourselves from vulgar notions, and raise our thoughts as far as they would reach to a closer contemplation of things, we might be able to aim at some dim and seeming conception how matter might at first be made and begin to exist by the power of that eternal first being.... But you will say, Is it not impossible to admit of the making anything out of nothing, since we cannot possibly conceive it? I answer—No; because it is not reasonable to deny the power of an infinite being [this phrase, in the absence of hypothesis, i.e., in Locke's other train of reasoning, is of course equivalent to the sum-total of possibility] because we cannot comprehend its operations. We do not deny other effects upon this ground, because we cannot possibly conceive the manner of their production. We cannot conceive how anything but impulse of body can move body; and yet that is not a reason sufficient to make us deny it possible, against the constant experience we have of it in ourselves, in all our voluntary motions, which are produced in us only by the free action or thought of our minds, and are not, nor can be, the effects of the impulse or determination of the blind matter in or upon our own bodies; for then it could not be in our power or choice to alter it. For example, my right hand writes, whilst my left hand is still: what causes rest in one and motion in the other? Nothing but my will, a thought in my mind; my thought only changing, the right hand rests, and the left hands moves. This is matter of fact, which cannot be denied: explain this and make it intelligible, and then the next step will be to understand creation."[[36]]