Thus much for the origin of the idea of cause. We have the same direct intuitive knowledge of cause that we have of effect; but we have not yet rendered a full and adequate account of the principle of causality. We have simply attained the notion of our personal causality, and we can not arbitrarily substitute our personal causality for all the causes of the universe, and erect our own experience as a law of the entire universe. We have, however, already seen (Chap. V.) that the belief in exterior causation is necessary and universal. When a change takes place, when a new phenomenon presents itself to our senses, we can not avoid the conviction that it must have a cause. We can not even express in language the relations of phenomena in time and space, without speaking of causes. And there is not a rational being on the face of the globe--a child, a savage, or a philosopher--who does not instinctively and spontaneously affirm that every movement, every change, every new existence, must have a cause. Now what account can philosophy render of this universal belief? One answer, and only one, is possible. The reason of man (that power of which Comte takes no account) is in fixed and changeless relation to the principle of causation, just as sense is in fixed and changeless relation to exterior phenomena, so that we can not know the external world, can not think or speak of phenomenal existence, except as effects. In the expressive and forcible language of Jas. Martineau: "By an irresistible law of thought all phenomena present themselves to us as the expression of power, and refer us to a causal ground whence they issue. This dynamic source we neither see, nor hear, nor feel; it is given in thought, supplied by the spontaneous activity of mind as the correlative prefix to the phenomena observed." [251] Unless, then, we are prepared to deny the validity of all our rational intuitions, we can not avoid accepting "this subjective postulate as a valid law for objective nature." If the intuitions of our reason are pronounced deceptive and mendacious, so also must the intuitions of the senses be pronounced illusory and false. Our whole intellectual constitution is built up on false and erroneous principles, and all knowledge of whatever kind must perish by "the contagion of uncertainty."

[Footnote 251: ][ (return) ] "Essays," p. 47.

Comte, however, is determined to treat the idea of causation as an illusion, whether under its psychological form, as will, or under its scientific form, as force. He feels that Theology is inevitable if we permit the inquiry into causes; [252] and he is more anxious that theology should perish than that truth should prevail. The human will must, therefore, be robbed of all semblance of freedom, lest it should suggest the idea of a Supreme Will governing nature; and human action, like all other phenomena, must be reduced to uniform and necessary law. All feelings, ideas, and principles guaranteed to us by consciousness are to be cast out of the account. Psychology, resting on self-observation, is pronounced a delusion. The immediate consciousness of freedom is a dream. Such a procedure, to say the least of it, is highly unphilosophical; to say the truth about it, it is obviously dishonest. Every fact of human nature, just as much as every fact of physical nature, must be accepted in all its integrity, or all must be alike rejected. The phenomena of mind can no more be disregarded than the phenomena of matter. Rational intuitions, necessary and universal beliefs, can no more be ignored than the uniform facts of sense-perception, without rendering a system of knowledge necessarily incomplete, and a system of truth utterly impossible. Every one truth is connected with every other truth in the universe. And yet Comte demands that a large class of facts, the most immediate and direct of all our cognitions, shall be rejected because they are not in harmony with the fundamental assumption of the positive philosophy that all knowledge is confined to phenomena perceptible to sense. Now it were just as easy to cast the Alps into the Mediterranean as to obliterate from the human intelligence the primary cognitions of immediate consciousness, or to relegate the human reason from the necessary laws of thought. Comte himself can not emancipate his own mind from a belief in the validity of the testimony of consciousness. How can he know himself as distinct from nature, as a living person, as the same being he was ten years ago, or even yesterday, except by an appeal to consciousness? Despite his earnestly-avowed opinions as to the inutility and fallaciousness of all psychological inquiries, he is compelled to admit that "the phenomena of life" are "known by immediate consciousness." [253] Now the knowledge of our personal freedom rests on precisely the same grounds as the knowledge of our personal existence. The same "immediate consciousness" which attests that I exist, attests also, with equal distinctness and directness, that I am self-determined and free.

[Footnote 252: ][ (return) ] "The inevitable tendency of our intelligence is towards a philosophy radically theological, so often as we seek to penetrate, on whatever pretext, into the intimate nature of phenomena" (vol. iv. p. 664).

[Footnote 253: ][ (return) ] "Positive Philos," vol. ii. p. 648.

In common with most atheistical writers, Comte is involved in the fatal contradiction of at one time assuming, and at another of denying the freedom of the will, to serve the exigencies of his theory. To prove that the order of the universe can not be the product of a Supreme Intelligence, he assumes that the products of mind must be characterized by freedom and variety--the phenomena of mind must not be subject to uniform and necessary laws; and inasmuch as the phenomena presented by external nature are subject to uniform and changeless laws, they can not be the product of mind. "Look at the whole frame of things," says he; "how can it be the product of mind--of a supernatural Will? Is it not subject to regular laws, and do we not actually obtain prevision of its phenomena? If it were the product of mind, its order would be variable and free." Here, then, it is admitted that freedom is an essential characteristic of mind. And this admission is no doubt a thoughtless, unconscious betrayal of the innate belief of all minds in the freedom of the will. But when Comte comes to deal with this freedom as an objective question of philosophy, when he directs his attention to the only will of which we have a direct and immediate knowledge, he denies freedom and variety, and asserts in the most arbitrary manner that the movements of the mind, like all the phenomena of nature, must be subject to uniform, changeless, and necessary laws. And if we have not yet been able to reduce the movements of mind, like the movements of the planets, to statistics, and have not already obtained accurate prevision of its successions or sequences as we have of physical phenomena, it is simply the consequence of our inattention to, or ignorance of, all the facts. We answer, there are no facts so directly and intuitively known as the facts of consciousness; and, therefore, an argument based upon our supposed ignorance of these facts is not likely to have much weight against our immediate consciousness of personal freedom. There is not any thing we know so immediately, so certainly, so positively, as this fact--we are free.

The word "force," representing as it does a subtile menial conception, and not a phenomenon of sense, must also be banished from the domains of Positive Science as an intruder, lest its presence should lend any countenance to the idea of causation. "Forces in mechanics are only movements, produced, or tending to be produced." In order to "cancel altogether the old metaphysical notion of force," another form of expression is demanded. It is claimed that all we do know or can possibly know is the successions of phenomena in time. What, then, is the term which henceforth, in our dynamics, shall take the place of "force?" Is it "Time-succession?" Then let any one attempt to express the various forms and intensities of movement and change presented to the senses (as e.g., the phenomena of heat, electricity, galvanism, magnetism, muscular and nervous action, etc.) in terms of Time-succession, and he will at once become conscious of the utter hopelessness of physics, without the hyperphysical idea of force, to render itself intelligible. [254] What account can be rendered of planetary motion if the terms "centrifugal force" and "centripetal force" are abandoned? "From the two great conditions of every Newtonian solution, viz., projectile impulse and centripetal tendency, eject the idea of force, and what remains? The entire conception is simply made up of this, and has not the faintest existence without it. It is useless to give it notice to quit, and pretend that it is gone when you have only put a new name upon the door. We must not call it 'attraction,' lest there should seem to be a power within; we are to speak of it only as 'gravitation,' because that is only 'weight,' which is nothing but a 'fact,' as if it were not a fact that holds a power, a true dynamic affair, which no imagination can chop into incoherent successions. [255] Nor is the evasion more successful when we try the phrase, 'tendency of bodies to mutual approach.' The approach itself may be called a phenomenon; but the 'tendency' is no phenomenon, and can not be attributed by us to the bodies without regarding them as the residence of force. And what are we to say of the projectile impulse in the case of the planets? Is that also a phenomenon? Who witnessed and reported it? Is it not evident that the whole scheme of physical astronomy is a resolution of observed facts into dynamic equivalents, and that the hypothesis posits for its calculations not phenomena, but proper forces? Its logic is this: If an impulse of certain intensity were given, and if such and such mutual attractions were constantly present, then the sort of motions which we observe in the bodies of our system would follow. So, however, they also would if willed by an Omnipotent Intelligence." [256] It is thus clearly evident that human science is unable to offer any explanation of the existing order of the universe except in terms expressive of Power or Force; that, in fact, all explanations are utterly unintelligible without the idea of causation. The language of universal rational intuition is, "all phenomena are the expression of power;" the language of science is, "every law implies a force."

[Footnote 254: ][ (return) ] See Grote's "Essay on Correlation of Physical Forces," pp. 18-20; and Martineau's "Essays," p. 135.

[Footnote 255: ][ (return) ] "Gravity is a real power of whose agency we have daily experience."--Herschel, "Outlines of Astronomy," p. 236.