due to a reactionary spirit of protest, and a collection of sceptical arguments, against "dogmatic systems" of philosophy in vogue, so much as to an adverse criticism of man's knowing-powers in answer to the fundamental question: What can we know? Kant, who was the first to raise this question, in his memorable reply to Hume, answered it by a distinction between "knowable phenomena" and "unknowable things-in-themselves". Hamilton soon followed with his doctrine that "we know only the relations of things". Modern Agnosticism is thus closely associated with Kant's distinction and Hamilton's principle of relativity. It asserts our inability to know the reality corresponding to our ultimate scientific, philosophic, or religious ideas. (5) Agnosticism, with special reference to theology, is a name for any theory which denies that it is possible for man to acquire knowledge of God. It may assume either a religious or an anti-religious form, according as it is confined to a criticism of rational knowledge or extended to a criticism of belief. De Bonald (1754–1840), in his theory that language is of divine origin, containing, preserving, and transmitting the primitive revelation of Good to man; De Lammenais (1782–1854), in his theory that individual reason is powerless, and social reason alone competent; Bonetty (1798–1879), in his advocacy of faith in God, the Scriptures, and the Church, afford instances of Catholic theologians attempting to combine belief in moral and religious truths with the denial that valid knowledge of the same is attainable by reason apart from revelation and tradition. To these systems of Fideism and Traditionalism should be added the theory of Mansel (1820–71), which Spencer regarded as a confession of Agnosticism, that the very inability of reason to know the being and attributes of God proves that revelation is necessary to supplement the mind's shortcomings. This attitude of criticising knowledge, but not faith, was also a feature of Sir William Hamilton's philosophy. (See Fideism and Traditionalism.) (6) The extreme view that knowledge of God is impossible, even with the aid of revelation, is the latest form of religious Agnosticism. The new theory regards religion and science as two distinct and separate accounts of experience, and seeks to combine an agnostic intellect with a believing heart. It has been aptly called "mental book-keeping by double entry". Ritschl, reviving Kant's separatist distinction of theoretical from practical reason, proclaims that the idea of God contains not so much as a grain of reasoned knowledge; it is merely "an attractive ideal", having moral and religious, but no objective, scientific, value for the believer who accepts it. Harnack locates the essence of Christianity in a filial relation felt towards an unknowable God the Father. Sabatier considers the words God, Father, as symbols which register the feelings of the human heart towards the Great Unknowable of the intellect. (7) Recent Agnosticism is also to a great extent anti-religious, criticizing adversely not only the knowledge we have of God, but the grounds of belief in Him as well. A combination of Agnosticism with Atheism, rather than with sentimental irrational belief, is the course adopted by many. The idea of God is eliminated both from the systematic and personal view which is taken of the world and of life. The attitude of "solemnly suspended judgment" shades off first into indifference towards religion, as an inscrutable affair at best, and next into disbelief. The Agnostic does not always merely abstain from either affirming or denying the existence of God, but crosses over to the old position of theoretic Atheism and, on the plea of insufficient evidence, ceases even to believe that God exists. While, therefore, not to be identified with Atheism, Agnosticism is often found in combination with it. (See Atheism.)
II. Total Agnosticism Self-refuting.—Total or complete Agnosticism—see (2)—is self-refuting. The fact of its ever having existed, even in the formula of Arcesilaos, "I know nothing, not even that I know nothing", is questioned. It is impossible to construct theoretically a self-consistent scheme of total nescience, doubt, unbelief. The mind which undertook to prove its own utter incompetence would have to assume, while so doing, that it was competent to perform the allotted task. Besides, it would be impossible to apply such a theory practically; and a theory wholly subversive of reason, contradictory to conscience, and inapplicable to conduct is a philosophy of unreason out of place in a world of law. It is the systems of partial Agnosticism, therefore, which merit examination. These do not aim at constructing a complete philosophy of the Unknowable, but at excluding special kinds of truth, notably religious, from the domain of knowledge. They are buildings designedly left unfinished.
III. Kant's distinction between Appearance and Reality examined.—Kant's idea of "a world of things apart from the world we know" furnished the starting-point of the modern movement towards constructing a philosophy of the Unknowable. With the laudable intention of silencing the sceptic Hume, he showed that the latter's analysis of human experience into particular sense-impressions was faulty and incomplete, inasmuch as it failed to recognize the universal and necessary elements present in human thought. Kant accordingly proceeded to construct a theory of knowledge which should emphasize the features of human thought neglected by Hume. He assumed that universality, necessity, causality, space, and time were merely the mind's constitutional way of looking at things, and in no sense derived from experience. The result was that he had to admit the mind's incapacity for knowing the reality of the world, the soul, or God, and was forced to take refuge against Hume's scepticism in the categorical imperative "Thou shalt" of the "moral reason". He had made "pure reason" powerless by his transfer of causality and necessity from the objects of thought to the thinking subject.
To discredit this idea of a "reality" inaccessibly hidden behind "appearances", it is sufficient to point out the gratuitous assumptions on which it is based. Kant's radical mistake was, to prejudge, instead of investigating, the conditions under which the acquisition of knowledge becomes possible. No proof was offered of the arbitrary assumption that the categories are wholly subjective; proof is not even possible. "The fact that a category lives subjectively in the act of knowing is no proof that the category does not at the same time truly express the nature of the reality known", [ Seth, "Two Lectures on Theism" (New York, 1897) p. 19.] The harmony of the mind's function with the objects it perceives and the relations it discovers shows that the ability of the mind to reach reality is involved in our very acts of perception. Yet Kant, substituting theory for fact, would disqualify the mind for its task of knowing the actual world we live in, and invent a hinterland of things-in-themselves never known as they are, but only as they appear to be. This use of a purely speculative principle to criticize the actual contents of human experience, is unjustifiable. Knowledge is a living process to be concretely investigated, not a mechanical affair for abstract reason to play with by introducing artificial severances of thought from object, and of reality from appearance. Once knowledge is regarded as a synthetic act of a self-active subject, the gap artificially created between subject and object, reality and appearance, closes of itself. (See Kant, Philosophy of.)
IV. Hamilton's Doctrine of Relativity examined.—Sir William Hamilton contributed the
