Already it's been a pleasure to revisit Kant. Thanks for the opportunity
@Sapientia , and the suggestion to do this reading-group style
@jamalrob
Preface
The preface states who the work is meant for -- not for apprentices of metaphysics who are just learning the ropes, not for historians of philosophy who must wait for the philosophers and scientists proper to create the new science he has in mind, not for those who look at the works of metaphysics in dismay, contempt, or of an attitude firmly decided on such questions by way of ancient authority -- but for those future teachers and founders of a science who already believe metaphysics is a worthwhile pursuit unto itself, and who might become lost in reading the proper treatment of the subject due to the self-admittedly literary weakness that academic requirements make of any work in that vein -- and who want a guide to begin understanding his arguments so that they may
fruitfully pursue metaphysics, and hopefully ground it as a proper scientific discipline, or barring that, show in what
other manner Hume's critique of knowledge may be successfully addressed.
As such we find the thesis of the Prolegomena in paragraph 7:
... there can be no such science unless the requirements expressed here, on which its possibility rests, are met, and, as this has never yet been done, that there is as yet no metaphysics at all — Kant
I separated out the previous quote for emphasis, though this immediately follows:
Since, however, the demand for it can never be exhausted, because the interest of human reason in general is much too intimately interwoven with it, the reader will admit that a complete reform or rather a rebirth of metaphysics, according to a plan completely unknown before now, is inevitably approaching, however much it may be resisted in the meantime
I quote this to emphasize in what way Kant's work is meant as a
propaedeutic to metaphysics.And so, in some ways, what we are dealing with in the Prolegomena is -- as far as explicit intent is concerned, at least -- something of a propaedeutic to the propaedeutic proper.
To emphasize this reading I would point a few pages later, after he gives some history of the problem he's dealing with (including his own struggles with it):
But I fear that the elaboration of the Humean problem in its greatest possible amplification (namely, the Critique of Pure Reason) may well fare just as the problem itself fared when it was first posed
. . .
with regard to a certain obscurity -- arising in part from the expansiveness of the plan, which makes it difficult to survey the main points upon which the investigation depends -- in this respect the complaint is just; and I will redress it through the present Prolegomena.
The previous work, which presents the faculty of pure reason in its entire extent and boundaries, thereby always remains the foundation to which the Prolegomena refer only as preparatory exercises; for this Critique must stand forth as science, systematic and complete to its smallest parts, before one can think of permitting metaphysics to come forward, or even of forming only a distant hope for metaphysics
Something that piqued my interest later is when Kant distinguishes between
methods to draw the distinction between the
Prolegomena and the
Critique -- namely, the
Prolegomena follows the analytic method, and the
Critique follows the synthetic method. Kant insists that the synthetic method is necessary to present all the articulations, whereas the analytic method is good enough -- after accepting the deduction (which, back then, was more akin to legal justification than dedeuctive logical inference) -- for giving the plan in broad strokes.
Lastly, I want to highlight one quote at the end to show what Kant is asking of his readers. In part it articulates what we mean today by "inference to the best explanation", I think -- which Kant is sometimes credited with articulating -- but historically speaking it's what makes Kant's philosophy truly critical, as opposed to either dogmatic or skeptical:
whosoever undertakes to judge or indeed to construct a metaphysics, must thoroughly satisfy the challenge made here, whether it happens that they accept my solution, or fundamentally reject it and replace it with another
(emphasis mine)
So our job isn't to just find why we disagree with Kant -- because, indeed, it's easy to see that
everyone except Kant disagrees with Kant
;) -- but to
judge whether we do, in fact, agree, and if we do not, to not fall into skepticism and present our own solution.