The foregoing passage highlights the ostensible purpose of the Transcendental Dialectic in Kant's Critique of Pure Reason – to expose the illusion that presumably generates traditional attempts in metaphysics. Kant, of course, is well known as the philosopher who undermined the disciplines of traditional, rationalist, metaphysics. Despite the undeniable influence of his arguments on subsequent philosophical traditions, however, and despite the wealth of secondary literature devoted to these arguments, there remain serious difficulties in interpreting his claims. Part of the problem is that Kant's rejection of the metaphysical arguments is linked up with a unique theory of error. Kant refers to this unique kind of error as “transcendental illusion,” and he clearly thinks that it provides an important insight in the propensities of the human mind to engage in speculative metaphysics.