Rickert is considered the head of the so-called Southwestern or Baden school of Neo-Kantianism, whose exponents worked in the philosophy departments at Freiburg and Heidelberg, both in the region of Baden in southwestern Germany. The Southwestern school stands in contrast to the so-called Marburg school, spearheaded by Hermann Cohen (1842–1918) and continued by Paul Natorp (1854–1924) and Ernst Cassirer (1874–1945). (For an overview of the two schools see Crowell 1999.)
In spite of their fierce opposition, the two schools present elements of similarity alongside the numerous elements of difference. These have been recently debated among Neo-Kantianism scholars (Krijnen 2001, 77–93; Krijnen/Noras 2012). One indisputably common element between the two schools is the preoccupation with the problem of validity, or Geltung, which is arguably the systematic core of Neo-Kantianism in general (Krijnen 2001, 84). Philosophy for the Neo-Kantians is concerned with the systematic elucidation of the a priori principles that allow for valid thinking in various spheres of knowledge. In keeping with Kant’s first Critique, valid thinking is not merely logically consistent thinking. Valid thinking requires, over and above the adherence to the laws of formal logic, thinking in accordance with the a priori principles governing the intelligibility of a given area of reality. These will be, for instance, the principles of causality, substantiality etc. in the sphere of physical nature and principles such as good and evil, responsibility, freedom, etc. in the sphere of ethics. It is the task of philosophy to identify these a priori principles in all the different spheres of culture, including politics, biology, art, history, etc. Helmuth Plessner captures metaphorically the spirit of Neo-Kantianism when he characterizes the Neo-Kantians as “botanists in the garden of the a priori” (Plessner 1974, 185).
In their attempt to clarify the way in which we should think of such principles, both the Southwestern and the Marburg Neo-Kantians reject any kind of psychological reading, which dominated among early 19th Century interpretations of Kant. The a priori principles of valid thinking are not mere facts about human psychology; they do not describe merely how our mind happens to function. Their validity is objective, that is, it is part of the formal structure of the objects of investigation and not merely an extrinsic mental scheme that exemplars of the species homo sapiens contingently apply to them.
Moreover, both schools were rather unenthusiastic about the label ‘Neo-Kantianism’. Their goal was not to go “back to Kant”, as Otto Liebmann (1840–1912) famously urged philosophers to do in his Kant und die Epigonen (Liebmann 1865), but, rather, to move forward beyond Kant building on his original views. Windelband, Rickert’s mentor and the forefather of Southwestern Neo-Kantianism, pronounced: “To understand Kant means to move beyond him” (Windelband 1915, IV). Likewise, the Marburg school leader Cohen pointed out: “From the very beginning I was concerned with developing Kant’s system further” (Cohen 1902, VII).
The two schools, however, diverge significantly in their interpretation of Kant. While the Marburg school was predominantly interested in the Critique of Pure Reason (Cohen 1885) and considered it to be an essay in the philosophical foundation of Newtonian science (a reading that is still prominent among contemporary Kant scholars, such as Friedmann 1992), Rickert and the Southwesterners emphasized the importance of reading Kant as a whole and considered the centerpiece of his philosophical program to be the system of the faculties outlined in the introduction to the Critique of Judgment (Rickert 1924b, 167). For Rickert, in particular, already in Kant’s first Critique “the focal point […] is not in the transcendental aesthetic and analytic but rather in the dialectic, and this means that the main problem of this work is not a theory of the experiential sciences (Erfahrungswissenschaften). Rather, it revolves around the old, ever-recurring problems of metaphysics. The work on these problems becomes the foundation for an encompassing theory of worldview culminating in the treatment of issues in the philosophy of religion. The theory of mathematics and physics is merely preparatory for the treatment of these issues” (Rickert 1924b, 153). Rickert’s Kant is primarily a philosopher of human culture at large, interested in questions about the meaning and value of our life in the world, whereas Cohen’s Kant is primarily (albeit not exclusively) a philosopher of the natural sciences. Incidentally, the largely ignored influence of Rickert’s Kant-interpretation is still vivid in Heidegger’s acclaimed book Kant and the Problem of Metaphysics (Heidegger 1997).
From these diverging interpretations of Kant flows another fundamental theoretical difference between the two schools. This difference has been effectively phrased by Rickert’s student, Emil Lask in terms of “pan-logism”, attributed to the Marburg Neo-Kantians, versus the “pan-archy of logos”, attributed to the Southwestern Neo-Kantians (Lask 1923, 133; Crowell 2010). If we take the distinction between intuition (Anschauung) and concept (Begriff) to be the fundamental paradigm of Kantian transcendentalism, then in Lask’s eyes the Marburg Neo-Kantians are committed to a kind of ‘pan-logism’ to the extent that they tend to minimize the role of intuition. As is particularly evident, for instance, in Natorp (1911, 26–67), for the Marburg Neo-Kantians whatever we might be tempted to consider a pure given or a raw datum of experience can be analyzed into an underlying thought-process, whereby the given is actually constructed according to a conceptually articulable (i.e., logical) pattern. Every alleged pure given (Gegebenes) is actually a task (Aufgegebenes) for conceptual thinking and can be resolved into an underlying thought process governed by logical a priori principles.
By contrast, Rickert and the Southwestern Neo-Kantians emphasize the ultimate irreducibility of what is given in intuition to conceptual forms. While everything can be grasped by concepts, and therefore no domain of reality and cultural life eludes in principle conceptual mastery (pan-archy), nothing can be grasped exhaustively by concepts, and therefore our rationality has to constantly take into account an irrational residue intrinsic to every conceptual construction. To conceptualize, for Rickert, is to recast the materials delivered immediately by the senses into a conceptual form. In so doing, we necessarily have to be selective, that is, we have to leave out of consideration an overwhelming amount of elements and take up in our conceptuality only those elements that match the criteria originally established for the purpose of solving our theoretical task. To give a simple example, in order to conceptualize, say, linear motion we have to isolate from the overwhelming amount of data stemming from the senses only those features that pertain to the movement of bodies (spatial location, speed, reciprocal position, etc.) and leave out of consideration everything else. This general characterization can serve as a prelude to Rickert’s theory of knowledge, which is the theme of the next section.
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