H. P. Grice's Metaphysical Argument

transcendental argument Metaphysics, epistemology An argument that starts from some accepted experience or fact to prove that there must be something which is beyond experience but which is a necessary condition for making the accepted experience or fact possible. The goal of a transcendental argument is to establish the transcendental dialectic truth of this precondition. If there is something X of which Y is a necessary condition, then Y must be true. This form of argument became prominent in Kant’s Critique of Pure Reason, where he argued that the existence of some fundamental a priori concepts, namely the categories, and of space and time as pure forms of sensibility, are necessary to make experience possible. In contemporary philosophy, transcendental arguments are widely proposed as a way of refuting skepticism. Wittgenstein used this form of argument to reject the possibility of a private language that only the speaker could understand. Peter Strawson employs a transcendental argument to prove the perception-independent existence of material particulars and to reject a skeptical attitude toward the existence of other minds. There is disagreement about the kind of necessity involved in transcendental arguments, and Barry Stroud has raised important questions about the possibility of transcendental arguments succeeding. “A transcendental argument attempts to prove q by proving it is part of any correct explanation of p, by proving it a precondition of p’s possibility.” Nozick Philosophical Explanations transcendental deduction Metaphysics, epistemology, ethics, aesthetics For Kant, the argument to prove that certain a priori concepts are legitimately, universally, necessarily, and exclusively applicable to objects of experience. Kant employed this form of argument to establish the legitimacy of space and time as the forms of intuition, of the claims of the moral law in the Critique of Practical Reason, and of the claims of the aesthetic judgment of taste in the Critique of Judgement. However, the most influential example of this form of argument appeared in the Critique of Pure Reason as the transcendental deduction of the categories. The metaphysical deduction set out the origin and character of the categories, and the task of the transcendental deduction was to demonstrate that these a priori concepts do apply to objects of experience and hence to prove the objective validity of the categories. The strategy of the proof is to show that objects can be thought of only by means of the categories. In sensibility, objects are subject to the forms of space and time. In understanding, experienced objects must stand under the conditions of the transcendental unity of apperception. Because these conditions require the determination of objects by the pure concepts of the understanding, there can be no experience that is not subject to the categories. The categories, therefore, are justified in their application to appearances as conditions of the possibility of experience. In the second edition of the Critique of Pure Reason (1787), Kant extensively rewrote the transcendental deduction, although he held that the result remained the same. The first version emphasized the subjective unity of consciousness, while the second version stressed the objective character of the unity, and it is therefore possible to distinguish between a subjective and objective deduction. The second version was meant to clarify the argument, but remained extremely difficult to interpret and assess. The presence of the two versions of this fundamental argument makes interpretation even more demanding. Generally speaking, European philosophers prefer the subjective version, while Anglo-American philosophers prefer the objective version. The transcendental deduction of the categories was a revolutionary development in modern philosophy. It was the main device by which Kant sought to overcome the errors and limitations of both rationalism and empiricism and propelled philosophy into a new phase. “The explanation of the manner in which concepts can thus relate a priori to objects I entitle their transcendental deduction.” Kant, Critique of Pure Reason