It has been already shown how Extension, having become identified with matter, took on its mechanical qualities, and was conceived as a connected series of causes or modes of motion. The parallel found by Spinoza for this series in Thought is the chain of reasons and consequents forming a demonstrative argument; and here he is obviously following Aristotle, who although ostensibly distinguishing between formal and efficient causes, hopelessly confounds them in the second book of his Posterior Analytics.[565] We are said to understand a thing when we bring it under a general rule, and also when we discover the mechanical agency which produces it. For instance, we may know that a particular man will die, either from the fact that all men are mortal, or from the fact that he has received a fatal wound. The general rule, however, is not the cause of what will happen, but only the cause of our knowing that it will happen; and knowledge of the rule by no means carries with it a knowledge of the efficient cause; as we see in the case of gravitation and other natural forces whose modus operandi is still a complete mystery. What deceived Aristotle was partly his false analysis of the syllogism, which he interpreted as the connexion of two terms by the interposition of a middle answering to the causal nexus of two phenomena; and partly his conception of the universe as a series of concentric spheres, through which movement is transmitted from without, thus combining the two ideas of notional comprehension and mechanical causation.
Be this as it may, Spinoza takes up the Aristotelian identification of logical with dynamical connexion, and gives it the widest possible development. For the Stagirite would not, at any rate, have dreamed of attributing any but a subjective existence to the demonstrative series, nor of extending it beyond the limits of our actual knowledge. Spinoza, on the other hand, assumes that the whole infinite chain of material causes is represented by a corresponding chain of eternal ideas; and this chain he calls the infinite intellect of God.[566] Here, besides the necessities of systematisation, the influence of mediaeval realism is plainly evident. For, when the absolute self-existence of Plato’s Ideas had been surrendered in deference to Aristotle’s criticism, a home was still found for them by Plotinus in the eternal Nous, and by the Christian Schoolmen in the mind of God; nor did such a belief present any difficulties so long as the divine personality was respected. The pantheism of Spinoza, however, was absolute, and excluded the notion of any but a finite subjectivity. Thus the infinite intellect of God is an unsupported chain of ideas recalling the theory at one time imagined by Plato.[567] Or its existence may be merely what Aristotle would have called potential; in other words, Spinoza may mean that reasons will go on evolving themselves so long as we choose to study the dialectic of existence, always in strict parallelism with the natural series of material movements constituting the external universe; and just as this is determined through all its parts by the totality of extension, or of all matter (whether moving or motionless) taken together, so also at the summit of the logical series stands the idea of God, from whose definition the demonstration of every lesser idea necessarily follows. It is true that in a chain of connected energies the antecedent, as such, must be always precisely equal to the consequent; but, apparently, this difficulty did not present itself to Spinoza, nor need we be surprised at this; for Kant, coming a century later, was still so imbued with Aristotelian traditions as, similarly, to derive the category of Cause and Effect from the relation between Reason and Consequent in hypothetical propositions.[568]
Meanwhile the parallelism between Thought and Extension was not exhausted by the identification just analysed. Extension was not only a series of movements; it still remained an expression for co-existence and adjacency. Spinoza, therefore, felt himself obliged to supply Thought with a correspondingly continuous quality. It is here that his chief originality lies, here that he has been most closely followed by the philosophy of our own time. Mind, he declares, is an attribute everywhere accompanying matter, co-extensive and co-infinite with space. Our own animation is the sum or the resultant of an animation clinging to every particle that enters into the composition of our bodies. When our thoughts are affected by an external impulse, to suppose that this impulse proceeds from anything material is a delusion; it is produced by the mind belonging to the body which acts on our body; although in what sense this process is to be understood remains a mystery. Spinoza has clearly explained the doctrine of animal automatism, and shown it to be perfectly conceivable;[569] but he has entirely omitted to explain how the parallel influence of one thought (or feeling) on another is to be understood; for although this too is spoken of as a causal relation, it seems to be quite different from the logical concatenation described as the infinite intellect of God; and to suppose that idea follows from idea like movement from movement would amount to a complete materialisation of mind; while our philosopher would certainly have repudiated Mr. Shadworth Hodgson’s theory, that states of consciousness are only connected through their extended substratum, as the segments of a mosaic picture are held together by the underlying surface of masonry. Nor can we admit that Spinoza entertained the theory, now so popular, according to which extension and consciousness are merely different aspects of a single reality. For this would imply that the substance which they manifest had an existence of its own apart from its attributes; whereas Spinoza makes it consist of the attributes, that is to say, identifies it with their totality. We are forced, then, to conclude that the proposition declaring thought and extension to be the same thing[570] has no other meaning than that they are connected by the double analogy which we have endeavoured to explain.
The analogy between Thought and Extension under the two aspects of necessary connexion and mere contingent relation in co-existence or succession, was, in truth, more interesting to its author as a basis for his ethical than as a development of his metaphysical speculations. The two orders of relations represent, in their distinction, the opposition of science to opinion or imagination, the opposition of dutiful conviction to blind or selfish impulse. Spinoza borrows from the Stoics their identification of volition with belief; but in working out the consequences of this principle it is of Plato rather than of the Stoics that he reminds us. The passions are in his system what sense, imagination, and opinion were in that of the Athenian idealist; and his ethics may almost be called the metaphysics of the Republic turned outside in. Joy, grief and desire are more or less imperfect perceptions of reality—a reality not belonging to the external world but to the conscious subject itself.[571] When Spinoza traces them to a consciousness or expectation of raised or lowered power, we recognise the influence of Hobbes; but when, here as elsewhere, he identifies power with existence, we detect a return to Greek forms of thought. The great conflict between illusion and reality is fought out once more; only, this time, it is about our own essence that we are first deceived and then enlightened. If the nature and origin of outward things are half revealed, half concealed by sense and imagination, our emotions are in like manner the obscuring and distorting medium through which we apprehend our inmost selves, and whatever adds to or takes away from the plenitude of our existence; and what science is to the one, morality and religion are to the other.
It is remarkable that while Spinoza was giving a new application to the Platonic method, another Cartesian, Malebranche, was working it out more strictly on the old lines of speculative research. The Recherche de la Vérité of this unjustly neglected thinker is a methodical account of the various subjective obstacles which impede our apprehension of things as they really exist, and of the means by which it may be facilitated. Here also, attention is concentrated on the subjective side of philosophy; and if the mental processes selected for study are of theoretical rather than practical interest, we may probably attribute this to the circumstance that every ethical question was already decided for Malebranche by the Church whose orders he had assumed.
But it was not merely in the writings of professed philosophers that the new aspect of Platonism found expression. All great art embodies in one form or another the leading conceptions of its age; and the latter half of the seventeenth century found such a manifestation in the comedies of Molière. If these works stand at the head of French literature, they owe their position not more to their author’s brilliant wit than to his profound philosophy of life; or rather, we should say that with him wit and philosophy are one. The comic power of Shakespeare was shown by resolving the outward appearances of this world into a series of dissolving illusions. Like Spinoza and Malebranche, Molière turns the illusion in, showing what perverted opinions men form of themselves and others, through misconceptions and passions either of spontaneous growth or sedulously fostered by designing hands. Society, with him, seems almost entirely made up of pretenders and their dupes, both characters being not unfrequently combined in the same person, who is made a victim through his desire to pass for what he is not and cannot be. And this is what essentially distinguishes the art of Molière from the New Comedy of Athens, which he, like other moderns, had at first felt inclined to imitate until the success of the Précieuses Ridicules showed him where his true opportunities lay. For the New Comedy was Aristotelian where it was not simply humanist; that is to say, it was an exhibition of types like those sketched by Aristotle’s disciple, Theophrastus, and already prefigured in the master’s own Ethics. These were the perennial forms in a world of infinite and perishing individual existences, not concealed behind phenomena, but incorporated in them and constituting their essential truth. The Old Comedy is something different again; it is pre-philosophic, and may be characterised as an attempt to describe great political interests and tendencies through the medium of myths and fables and familiar domesticities, just as the old theories of Nature, the old lessons of practical wisdom, and the first great national chronicles had been thrown into the same homely form.[572]
The purely intellectual view of human nature, the definition of mind in terms of cognition, is one more fallacy from which Aristotle’s teaching, had it not fallen into neglect or contempt, might have guarded Spinoza. Nevertheless, his parallelism between passion and sensuous perception saves him from the worst extravagances of his Greek predecessors. For the senses, however much they might be maligned, never were nor could be altogether rejected; while the passions met with little mercy from Plato and with none from the Stoics, who considered them not only unnecessary but even unnatural. Spinoza more wisely sees in them assertions, however obscure and confused, of the will to be and grow which constitutes individual existence. And he sees that they can no more be removed by pointing out their evil consequences than sense-impressions can be abolished by proving their fallaciousness. On the other hand, when Spinoza speaks as if one emotion could only be conquered or expelled by another emotion, we must not allow his peculiar phraseology to conceal from us the purely intellectual character of his whole ethical system. What he really holds is that emotion can be overcome by reason or better knowledge, because it is itself an imperfect cognition. Point by point, an analogy—or something more than an analogy—is made out between the errors of sensuous perception joined to imagination, and the errors of our spontaneous efforts after happiness or self-realisation. Both are imposed on us from without, and neither can be got rid of by a simple act of volition. Both are affected by illusions of perspective: the nearer object of desire, like the nearer object of perception, assuming a disproportionate place in the field of view. In both, accidental contiguity is habitually confounded with causation; while in both the assignment of causes to effects, instead of being traced back through an infinite series of antecedents, stops short with the antecedent nearest to ourselves. If objects are classified according to their superficial resemblances or the usages of common language, so also are the desires sustained and intensified by imitation and rivalry. By parity of reasoning, moral education must be conducted on the same lines as intellectual education. First, it is shown how our individual existence, depending as it does on forces infinitely exceeding our own, is to be maintained. This is chiefly done by cultivating friendly relations with other men; probably, although Spinoza does not himself make the comparison, on the same principle as that observed in the mutual assistance and rectification of the senses, together with their preservation by means of verbal signs. The misleading passions are to be overcome by discovering their origin; by referring the pleasures and pains which produce them to the right causes; by calling in thought to redress the balance of imagination; by dividing the attention among an infinite number of causes; finally, by demonstrating the absolute necessity of whatever actions excite them, and classifying them according to their relations, in the same way that the phenomena of the material world are dealt with when subjected to scientific analysis.
So far Spinoza, following the example of Stoicism, has only studied the means by which reason conquers passion. He now proceeds to show, in the spirit of Plato or of Platonic Christianity, how immensely superior to the pleasures of sense and opinion are those afforded by true religion—by the love of God and the possession of eternal life. But, here also, as in the Greek system, logic does duty for emotion. The love of God means no more than viewing ourselves as filling a place in the infinite framework of existence, and as determined to be what we are by the totality of forces composing it. And eternal life is merely the adjustment of our thoughts to the logical order by which all modes of existence are deducible from the idea of infinite power.
Thus, while Spinoza draws to a head all the tendencies inherited from Greek philosophy, borrowing from the early physicists their necessarianism; from the Atomists, their exclusion of final causes, their denial of the supernatural, and their infinite worlds; from the Athenian school, their distinction between mind and body and between reason and sense; from Aristotle, his parallelism between causation and syllogism; from the Epicureans, their vindication of pleasure; and from the Stoics, their identification of belief with action, their conquest of passion and their devotion to humanity;—it is to the dominant Platonism of the seventeenth century that his system owes its foundation, its development, and its crown; for he begins by realising the abstract conception of being, and infers its absolute infinity from the misleading analogy of space, which is not an abstraction at all; deduces his conclusions according to the geometrical method recommended by Plato; and ends, like Plato, by translating dialectic formulas into the emotional language of religious faith.[573]