6. A true idea is one which corresponds with its ideate.

7. The essence of anything which can be conceived as non-existent does not involve existence.

Such is our metaphysical outfit of simple ideas with which to start upon our enterprise of learning. The larger number of them, so far from being simple, must be absolutely without meaning to persons whose minds are undisciplined in metaphysical abstraction; they become only intelligible propositions as we look back upon them with the light of the system which they are supposed to contain.

Although, however, we may justly quarrel with such unlooked-for difficulties, the important question, after all, is not of the obscurity of these axioms, but of their truth. Many things in all the sciences are obscure to an unpractised understanding, which are true enough and clear enough to people acquainted with the subjects, and they may be fairly made the foundations of a scientific system, although rudimentary students must be contented to accept them upon faith. Of course, also, it is entirely competent to Spinoza, or to any one, to define the terms which he intends to use just as he pleases, provided it be understood that any conclusions which he derives out of them apply only to the ideas so defined, and not to any supposed object existing which corresponds with them. Euclid defines his triangles and circles, and discovers that to figures so described, certain properties previously unknown may be proved to belong. But as in nature there are no such things as triangles and circles exactly answering the definition, his conclusions, as applied to actually existing objects, are either not true at all or only proximately so. Whether it be possible to bridge over the gulf between existing things and the abstract conception of them, as Spinoza attempts to do, we shall presently see. It is a royal road to certainty if it be a practicable one; but we cannot say that we ever met any one who could say honestly Spinoza's reasonings had convinced him; and power of demonstration, like all other powers, can be judged only by its effects. Does it prove? does it produce conviction? If not, it is nothing.

We need not detain our readers among these abstractions. The power of Spinozism does not lie so remote from ordinary appreciation, or we should long ago have heard the last of it. Like all other systems which have attracted followers, it addresses itself, not to the logical intellect, but to the imagination, which it affects to set aside. We refuse to submit to the demonstrations by which it thrusts itself upon our reception; but regarding it as a whole, as an attempt to explain the nature of the world of which we are a part, we can still ask ourselves how far the attempt is successful. Some account of these things we know that there must be, and the curiosity which asks the question regards itself, of course, as competent in some degree to judge of the answer to it.

Before proceeding, however, to regard this philosophy in the aspect in which it is really powerful, we must clear our way through the fallacy of the method.

The system is evolved in a series of theorems in severely demonstrative order out of the definitions and axioms which we have translated. To propositions 1-6 we have nothing to object; they will not, probably, convey any very clear ideas, but they are so far purely abstract, and seem to follow (as far as we can speak of 'following' in such subjects) by fair reasoning. 'Substance is prior in nature to its affections.' 'Substances with different attributes have nothing in common,' and, therefore, 'one cannot be the cause of the other.' 'Things really distinct are distinguished by difference either of attribute or mode (there being nothing else by which they can be distinguished), and, therefore, because things modally distinguished do not quâ substance differ from one another, there cannot be more than one substance of the same attribute. Therefore (let us remind our readers that we are among what Spinoza calls notiones simplicissimas), since there cannot be two substances of the same attribute, and substances of different attributes cannot be the cause one of the other, it follows that no substance can be produced by another substance.'

The existence of substance, he then concludes, is involved in the nature of the thing itself. Substance exists. It does and must. We ask, why? and we are answered, because there is nothing capable of producing it, and therefore it is self-caused—i.e. by the first definition the essence of it implies existence as part of the idea. It is astonishing that Spinoza should not have seen that he assumes the fact that substance does exist in order to prove that it must. If it cannot be produced and exists, then, of course, it exists in virtue of its own nature. But supposing it does not exist, supposing it is all a delusion, the proof falls to pieces. We have to fall back on the facts of experience, on the obscure and unscientific certainty that the thing which we call the world, and the personalities which we call ourselves, are a real substantial something, before we find ground of any kind to stand upon. Conscious of the infirmity of his demonstration, Spinoza winds round it and round it, adding proof to proof, but never escaping the same vicious circle: substance exists because it exists, and the ultimate experience of existence, so far from being of that clear kind which can be accepted as an axiom, is the most confused of all our sensations. What is existence? and what is that something which we say exists? Things—essences—existences! these are but the vague names with which faculties, constructed only to deal with conditional phenomena, disguise their incapacity. The world in the Hindoo legend was supported upon the back of the tortoise. It was a step between the world and nothingness, and served to cheat the imagination with ideas of a fictitious resting-place.

If any one affirms (says Spinoza) that he has a clear, distinct—that is to say, a true—idea of substance, but that nevertheless he is uncertain whether any such substance exist, it is the same as if he were to affirm that he had a true idea, but yet was uncertain whether it was not false. Or if he says that substance can be created, it is like saying that a false idea can become a true idea—as absurd a thing as it is possible to conceive; and therefore the existence of substance, as well as the essence of it, must be acknowledged as an eternal verity.

It is again the same story. Spinoza speaks of a clear idea of substance; but he has not proved that such an idea is within the compass of the mind. A man's own notion that he sees clearly, is no proof that he really sees clearly; and the distinctness of a definition in itself is no evidence that it corresponds adequately with the object of it. No doubt a man who professes to have an idea of substance as an existing thing, cannot doubt, as long as he has it, that substance so exists. This is merely to say that as long as a man is certain of this or that fact, he has no doubt of it. But neither his certainty nor Spinoza's will be of any use to a man who has no such idea, and who cannot recognise the lawfulness of the method by which it is arrived at.