A philosophical theory of the limitations of knowledge, professing doubt of or disbelief in some or all of the powers of knowing possessed by the human mind .

(1) The word Agnostic (Greek a, privative + gnostiks "knowing") was coined by Professor Huxley in 1869 to describe the mental attitude of one who regarded as futile all attempts to know the reality corresponding to our ultimate scientific, philosophic, and religious ideas. As first employed by Huxley, the new term suggested the contrast between his own unpretentious ignorance and the vain knowledge which the Gnostics of the second and third century claimed to possess. This antithesis served to discredit the conclusions of natural theology, or theistic reasoning, by classing them with the idle vapourings of Gnosticism. The classification was unfair, the attempted antithesis overdrawn. It is rather the Gnostic and the Agnostic who are the real extremists; the former extending the bounds of knowledge, and the latter narrowing them, unduly. Natural theology, or theism, occupies the middle ground between these extremes, and should have been disassociated both from the Gnostic position, that the mind can know everything, and from the Agnostic position, that it can know nothing concerning the truths of religion. (See GNOSTICISM.)

(2) Agnosticism, as a general term in philosophy, is frequently employed to express any conscious attitude of doubt, denial, or disbelief, towards some, or even all, of man's powers of knowing or objects of knowledge. The meaning of the term may accordingly vary, like that of the other word "Scepticism", which it has largely replaced, from partial to complete Agnosticism; it may be our knowledge of the world, of the self, or of God, that is questioned; or it may be the knowableness of all three, and the validity of any knowledge, whether of sense or intellect, science or philosophy, history, ethics, religion. The variable element in the term is the group of objects, or propositions, to which it refers; the invariable element, the attitude of learned ignorance it always implies towards the possibility of acquiring knowledge.

(3) Agnosticism, as a term of modern philosophy, is used to describe those theories of the limitations of human knowledge which deny the constitutional ability of the mind to know reality and conclude with the recognition of an intrinsically Unknowable. The existence of "absolute reality" is usually affirmed while, at the same time, its knowableness is denied. Kant, Hamilton, Mansel, and Spencer make this affirmation an integral part of their philosophic systems. The Phenomenalists , however, deny the assertion outright, while the Positivists , Comte and Mill, suspend judgment concerning the existence of "something beyond phenomena". (See POSITIVISM.)

(4) Modern Agnosticism differs from its ancient prototype. Its genesis is not 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.)

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.

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.

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CATHOLIC ENCYCLOPEDIA: Agnosticism - New Advent