What, then, was the work which Ferrier placed before himself when he commenced to write upon and teach philosophy? He was thoroughly and entirely dissatisfied with the old point of view, the point of view of the 'common-sense' school of metaphysicians, to begin with. Sometimes it seems as though we could not judge a system altogether from the best exponent of it, although theoretically we are always bound to turn to him. In a national philosophy, at least, we want something that will wear, that will bear to be put in ordinary language, something which can be understood of the people, which can be assimilated with the popular religion and politics—in fact, which can really be lived as well as thought; and it is only after many years of use that we can really tell whether these conditions have been fulfilled. For this reason we are in some measure justified in taking the popular estimate of a system, and in considering its practical results as well as the value of its theory. Now, the commonly accepted view of the eighteenth-century philosophers in Scotland is that there is nothing very wonderful about the subject—like the Bourgeois Gentilhomme of Molière, we are shown that we have been philosophising all our lives, only we never knew it. 'Common-sense'—an attribute with which we all believe we are in some small measure endowed—explains everything if we simply exercise it, and that is open to us all: there has been much talk, it would seem, about nothing; secrets hidden to wise men are revealed to babes, and we have but to keep our minds open in order to receive them.

We are all acquainted with this talk in speculative regions of knowledge, but we most of us also know how disastrous it is to any true advancement in such directions. What happens now is just what happened in the eighteenth century. Men relapse into a self-satisfied indolence of mind: in religion they are content with believing in a sort of general divine Beneficence which will somehow make matters straight, however crooked they may seem to be; and in philosophy they are guided by their instincts, which teach them that what they wish to believe is true.

Now, all this is what Ferrier and the modern movement, largely influenced by German modes of thought, wish to protest against with all their might. The scepticism of Hume and Gibbon was logical, if utterly impossible as a working creed and necessarily ending in absurdity; but this irrational kind of optimism was altogether repugnant to those who demanded a reasonable explanation of themselves and of their place in nature. The question had become summed up in one of superlative importance, namely, the distinction that existed between the natural and supernatural sides of our existence. The materialistic school had practically done away with the latter in its entirety, had said that nature is capable of being explained by mechanical means, and that these must necessarily suffice for us. But the orthodox section adopted other lines; it accepted all the ordinarily received ideas of God, immortality, and the like, but it maintained the existence of an Absolute which can only be inferred, but not presented to the mind, and, strangest of all, declared that the 'last and highest consecration of all true religion must be an altar "To the unknown and unknowable God."'[6] This so-called 'pious' philosophy declares that 'To think that God is, as we can think Him to be, is blasphemy,' and 'A God understood would be no God at all.' The German philosophy saw that if once we are to renounce our reason, or trust to it only within a certain sphere, all hope for us is lost, as far as withstanding the attack of outside enemies is concerned. We are liable to sceptical attacks from every side, and all we can maintain against them is a personal conviction which is not proof. How, then, was the difficulty met?

Kant, as we have said, made an important development upon the position of Hume. Hume had arrived at the point of declaring the particular mind and matter equally incompetent to afford an ultimate explanation of things, and he suggested experience in their place. This is the first note of the new philosophy: experience, not a process of the interaction of two separate things, mind on the one hand, matter on the other, but something comprehending both. This, however, was scarcely realised either by Hume or Kant, though the latter came very near the formulation of it. Kant saw, at least, that things could not produce knowledge, and he therefore changed his front and suggested starting with the knowledge that was before regarded as result—a change in point of view that caused a revolution in thought similar to that caused in our ideas of the natural world by the introduction of the system of Copernicus. Still, while following out his Copernican theory, Kant did not go far enough. His methods were still somewhat psychological in nature. He still regarded thought as something which can be separated from the thinker; he still maintained the existence of things in themselves independent and outside of thought. He gives us a 'theory' of knowledge, when what we want to reach is knowledge itself, and not a subjective conception of it.

Here it is that the Absolute Idealism comes in—the Idealism most associated with the name of Hegel. Hegel takes experience, knowledge, or thought, in another and much more comprehensive fashion than did his predecessors. Knowledge, in fact, is all-comprehending; it embraces both sides in itself, and explains them as 'moments,' i.e. complementary factors in the one Reality. To make this clearer: we have been all along taking knowledge as a dualistic process, as having two sides involved in it, a subject and an object. Now, Hegel says our mistake is this: we cannot make a separation of such a kind except by a process of abstraction: the one really implies the other, and could not possibly exist without it. We may in our ordinary pursuits do so, without doubt; we may concentrate our attention on one side or the other, as the case may be; we may look at the world as if it could be explained by mechanical means, as, indeed, to a certain point it can. But, Hegel says, these explanations are not sufficient; they can easily be shown to be untrue, when driven far enough: the world is something larger; it has the ideal side as well as the real, and, as we are placed, they are both necessarily there, and must both be recognised, if we are to attain to true conceptions.

Without saying that Ferrier wholly assimilated the modern German view,—for of course he did not,—he was clearly largely influenced by it, more largely perhaps than he was even himself aware. It particularly met the present difficulties with which he was confronted. The negative attitude was felt to be impossible, and the other, the Belief which then, as now, was so strongly advocated, the Belief which meant a more or less blind acceptance of a spiritual power beyond our own, the Belief in the God we cannot know and glory in not being able so to know, he felt to be an equal impossibility. Ferrier, and many others, asked the question, Are these alternatives exhaustive? Can we not have a rational explanation of the world and of ourselves? Can we not, that is, attain to freedom? The new point of view seemed in some measure to meet the difficulty, and therefore it was looked to with hope and anticipation even although its bearing was not at first entirely comprehended. Ferrier was one of those who perceived the momentous consequences which such a change of front would cause, and he set himself to work it out as best he could. In an interesting paper which he writes on 'The Philosophy of Common-Sense,' with special reference to Sir William Hamilton's edition of the works of Dr. Reid, we see in what way his opinions had developed.

The point which Ferrier made the real crux of the whole question of philosophy was the distinction which exists between the ordinary psychological doctrine of perception and the metaphysical. The former drew a distinction between the perceiving mind and matter, and based its reasonings on the assumed modification of our minds brought about by matter regarded as self-existent, i.e. existent in itself and without regard to any perceiving mind. Now, Ferrier points out that this system of 'representationalism,' of representative ideas, necessarily leads to scepticism; for who can tell us more, than that we have certain ideas—that is, how can it be known that the real matter supposed to cause them has any part at all in the process? Scepticism, as we saw before, has the way opened up for it, and it doubts the existence of matter, seeing that it has been given no reasonable grounds for belief in it, while Idealism boldly denies its instrumentality and existence. What then, he asks, of Dr. Reid and his School of Common-Sense? Reid cannot say that matter is known in consciousness, but what he does say is that something innately born within us forces us to believe in its existence. But then, as Ferrier pertinently points out, scepticism and idealism do not merely doubt and deny the existence of a self-existent matter as an object of consciousness, but also because it is no object of belief. And what has Reid to show for his beliefs? Nothing but his word. We must all, Ferrier says, be sceptics or idealists; we are all forced on to deny that matter in any form exists, for it is only self-existent matter that we recognise as psychologists. Stewart tries to reinstate it by an appeal to 'direct observation,' an appeal which, Ferrier truly says, is manifestly absurd; reasoning is useless, and we must, it would appear, allow any efforts we might make towards rectifying our position to be recognised as futile.

But now, Ferrier says, the metaphysical solution of the problem comes in. We are in an impasse, it would appear; the analysis of the given fact is found impossible. But the failure of psychology opens up the way to metaphysic. 'The turning-round of thought from psychology to metaphysic is the true interpretation of the Platonic conversion of the soul from ignorance to knowledge, from mere opinion to certainty and satisfaction; in other words, from a discipline in which the thinking is only apparent, to a discipline in which the thinking is real.' 'The difference is as great between "the science of the human mind" and metaphysic, as it is between the Ptolemaic and the Copernican astronomy, and it is very much of the same kind.' It is not that metaphysic proposes to do more than psychology; it aims at nothing but what it can fully overtake, and does not propose to carry a man farther than his tether extends, or the surroundings in which he finds himself. Metaphysic in the hands of all true astronomers of thought, from Plato to Hegel, if it accomplishes more, attempts less.

Metaphysic, Ferrier says, demands the whole given fact, and that fact is summed up in this: 'We apprehend the perception of an object,' and nothing short of this suffices—that is, not the perception of matter, but our apprehension of that perception, or what we before called knowledge, ultimate knowledge in its widest sense. And this given fact is unlike the mere perception of matter, for it is capable of analysis and is not simply subjective and egoistic. Psychology recognises perception on the one hand (subjective), and matter on the other (objective), but metaphysic says the distinction ought to be drawn between 'our apprehension' and 'the perception-of-matter,' the latter being one fact and indivisible, and on no account to be taken as two separate facts or thoughts. The whole point is, that by no possible means can the perception-of-matter be divided into two facts or existences, as was done by psychology. And Ferrier goes on to point out that this is not a subjective idealism, it is not a condition of the human soul alone, but it 'dwells apart, a mighty and independent system, a city fitted up and upheld by the living God.' And in authenticating this last belief Ferrier calls in internal convictions, 'common-sense,' to assist the evidence of speculative reason, where, had he followed more upon the lines of the great German Idealists, he might have done without it.

Now, Ferrier continues, we are safe against the cavils of scepticism; the metaphysical theory of perception steers clear of all the perplexities of representationalism; for it gives us in perception one only object, the perception of matter; the objectivity of this datum keeps us clear from subjective idealism.