‘1. Combining several simple ideas into one compound one, and thus all complex ideas are made. 2. The second is bringing two ideas, whether simple or complex, together, and setting them by one another, so as to take a view of them at once, without uniting them into one; in which way it gets all its ideas of relations. 3. The third is separating them from all other ideas that accompany them in their real existence; this is called abstraction: and thus all its general ideas are made. This shows man’s power to be much about the same in the material and intellectual world: for the materials in both being such as he has no power over, either to make or destroy, all that man can do is either to unite them together, or to set them by one another, or wholly to separate them.’—Vol. i. p. 151.
The first great point which Mr. Locke labours to prove in his Essay, is that there are no innate ideas, which he seems to have established very fully and clearly, if indeed so obvious a truth required any formal demonstration. His chief proofs are from the case of a man born blind, who has no idea of colours, and from the ignorance which children and idiots have of those first principles and universal maxims, which some philosophers and theologians, confounding the faculties of the mind with actual impressions, had supposed to be legibly engraven on the mind by the hand of its author. For the supposing the understanding to be a distinct faculty of the mind no more proves our ideas to be innate, than the allowing perception to be a distinct original faculty of the mind, which everybody does, proves that there must be innate sensations. These two positions have, however, been sometimes considered as convertible by the partisans on both sides of the question; the one arguing from the existence of the soul and the power of thought to the positive perception of certain truths, and the others concluding that by denying any original inherent impressions, they had overturned the supposition of the different faculties and powers which must be in the mind, to account for the first production or subsequent modification of sensation or of thought. For instance, it has been made a consequence of the doctrine that there were no innate ideas, that there could be no such thing as genius, or an original difference of capacity; as if the capacity were not perfectly distinct from the actual impressions by the very theory itself, and as if there might not be a difference in the capacity of acquiring ideas as all experience shows, though none in the knowledge acquired, because this capacity had never yet been exerted. As well might we argue that of two houses that are just built one is as commodious and capacious as the other, as well fitted for the reception of guests and the disposal of furniture, because at present neither of them is furnished or inhabited.
The following passages will show the manner in which our author treats this part of his subject:
‘The child certainly knows that the nurse that feeds it is neither the cat it plays with, nor the blackamoor it is afraid of: that the wormseed or mustard it refuses is not the apple or sugar it cries for; this it is certainly and undoubtedly assured of: but will any one say it is by virtue of this principle, That it is impossible for the same thing to be and not to be, that it so firmly assents to these and other parts of its knowledge? Or that the child has any notion or apprehension of that proposition at an age, wherein yet, it is plain, it knows a great many other truths? He that will say, children join these several abstract speculations with their sucking bottles and their rattles, may perhaps with justice be thought to have more passion and zeal for his opinion, but less sincerity and truth than one of that age. Though therefore there be several general propositions that meet with constant and ready assent as soon as proposed to men grown up, who have attained the use of more general and abstract ideas, and names standing for them, yet they not being to be found in those of tender years, who nevertheless know other things, they cannot pretend to universal assent of intelligent persons, and so by no means can be supposed innate: it being impossible, that any truth which is innate (if there were any such) should be unknown, at least to any one who knows any thing else. Since if they are innate truths, they must be innate thoughts; there being nothing a truth in the mind which it has never thought on.
‘That the general maxims we are discoursing of, are not known to children, idiots, and a great part of mankind, we have already sufficiently proved. But there is this farther argument against their being innate, that these characters, if they were native and original impressions, should appear fairest and clearest in those persons in whom yet we find no footsteps of them. And it is in my opinion a strong presumption that they are not innate, since they are least known to those in whom if they were innate, they must need exert themselves with most force and vigour. For children, idiots, savages, and illiterate people being of all others the least corrupted by custom or borrowed opinion, learning or education having not cast their native thoughts into new moulds, nor by superinducing foreign and studied doctrines, confounded those fair characters nature had written there; one might reasonably imagine that in their minds these innate notions should lie open fairly to every one’s view, as it is certain the thoughts of children do. One would think according to these men’s principles that all these native beams of light (were there any such) should in those who have no reserves, no acts of concealment, shine out in their full lustre, and leave us in no more doubt of their being there than we are of their love of pleasure and abhorrence of pain. But alas, amongst children, idiots, savages, and the grossly illiterate, what general maxims are to be found? What universal principle of knowledge? Their notions are few and narrow, borrowed only from those objects they have had most to do with, and which have made upon their senses the frequentest and strongest impressions. A child knows his nurse and his cradle, and by degrees the playthings of a little more advanced age; and a young savage has perhaps his head filled with love and hunting, according to the fashion of his tribe. But he that from a child untaught, or a wild inhabitant of the woods will expect these abstract maxims and reputed principles of science, will I fear find himself mistaken. Such kind of general propositions [as that which is, is; and that it is impossible for the same thing to be and not to be] are seldom mentioned in the huts of Indians, much less are they to be found in the thoughts of children, or any impressions of them on the minds of naturals. They are the language and business of the schools and academies of learned nations, accustomed to that sort of conversation or learning, where disputes are frequent: these maxims being suited to artificial argumentation, and useful for conviction, but not much conducing to the discovery of truth, or advancement of knowledge.’
I do not know that Mr. Locke has sufficiently distinguished between two things which I cannot very well express otherwise than by a turn of words, namely, an innate knowledge of principles, and innate principles of knowledge. His arguments seem to me conclusive against the one, but not against the other, for I think that there are certain general principles or forms of thinking, something like the moulds in which any thing is cast, according to which our ideas follow one another in a certain order, though the knowledge, i.e., perception of what these principles are, and the forming them into distinct propositions is the result of experience. It is true, the child distinguishes between its nurse and the blackamoor, between bitter and sweet: what hinders it from confounding them? The ideas of same and different are not included in these ideas themselves, nor are they peculiar to any of them, but general terms. What then determines the child to annex them uniformly to certain things and not to others? It is plain then, that our ideas are not at liberty to run into clusters as they please or as it happens, but are regulated by certain laws, to which they must conform; or that the manner in which we conceive of things does not depend simply on the particular nature of the things, but on the general nature of the understanding. Mr. Locke is clear for certain innate practical principles or general tendencies regulating all our actions, namely, the love of pleasure, and aversion to pain. He does not however admit, as I can find, of any thing similar to the operations of the understanding. The analogy, notwithstanding, holds exactly the same in both cases. For the child is no more conscious of any such general practical principle regulating all his desires, than of any speculative principle regulating his notion of things: he gets the idea of both from experience of their effects; but I think that if there were no such principles in the mind itself, previous to the actual impression of objects, and merely developed or called into action by them, we must be perfectly indifferent both to the reception of pleasure and pain, as we should feel no more repugnance to admit one conclusion than another, however absurd or contradictory. The necessity we are under of perceiving certain agreements or disagreements between our ideas is as much, and in the same sense, the foundation of judgment and reasoning, as the general desire of happiness and aversion to misery is the foundation of morality.
This property of the understanding, by which certain judgments, naturally follow certain perceptions, and are followed by other judgments, is the faculty of reason, of order and proportion in the mind, and is indeed nothing but the understanding acting by rule or necessity. The long controversy between Locke and Leibnitz with respect to innate ideas turned upon the distinction here stated, innate ideas being thus referred not to the actual impressions of objects, but to the forms or moulds existing in the mind, and in which those impressions are cast. Leibnitz contended that there was a germ or principle of truth, a pre-established harmony between its innate faculties and its acquired ideas, implied in the essence of the mind itself. According to the one it was like a piece of free stone, which the mason hews with equal ease in all directions, and into any shape, as circumstances require: according to the other, it resembles a piece of marble strongly ingrained, with the figure of a man, or other animal, inclosed in it, and which the sculptor has only to separate from the surrounding mass.
I will add one more passage to draw the attention of my readers to this intricate subject, and to show that the difficulties surrounding it were not completely cleared up or even apprehended by the author of the ‘Essay.’
‘Hath a child,’ he says, ‘an idea of impossibility and identity, before it has of white or black, sweet or sour? Or is it from the knowledge of this principle that it concludes that wormwood rubbed on the nipple hath not the same taste that it used to receive from thence? Is it the actual knowledge of Impossibile est idem esse et non esse that makes a child distinguish between its mother and a stranger, or that makes it fond of the one, and fly the other? Or does the mind regulate itself and its assent by ideas that it never had? Or the understanding draw conclusions from principles which it never yet knew or understood? The names impossibility and identity stand for two ideas, so far from being innate, or born with us, that I think it requires great care and attention to form them right in our understandings. They are so far from being brought into the world with us, so remote from the thoughts of infancy and childhood, that I believe upon examination it will be found that many grown men want them.
‘If identity (to instance in that alone) be a native impression, and consequently so clear and obvious to us that we must needs know it even from our cradles; I would gladly be resolved by one of seven or seventy years old, Whether a man, being a creature consisting of soul and body, be the same man when his body is changed? Whether Euphorbus and Pythagoras, having had the same soul, were the same man, though they lived several ages asunder? Nay, whether the cock too, which had the same soul, were not the same with both of them? Whereby perhaps it will appear that our idea of sameness is not so settled and clear as to deserve to be thought innate in us. For if those innate ideas are not so clear and distinct as to be universally known and naturally agreed on, they cannot be subjects of universal and undoubted truths, but will be the unavoidable occasion of perpetual uncertainty. For I suppose every one’s idea of identity will not be the same that Pythagoras and thousand others of his followers have: and which then shall be true, which innate? Or are these two different ideas of identity both innate?’—Page 60.