(and within these, of the individual forms). The connections between them must al ways be thought of as'necessary', i.e. as visible in or created 'by the forms themselves, or at least by the principle according to which forms are constructed. That is to say, the correct positing of a principle implies- at least in its general tendency -the positing of the whole system determined by it; the consequences are contained in the principle, they can be deduced from it, they are predictable and calculable. The real evolution of the totality of postulates may appear as an infinite process, but this limitation means only that we cannot survey the whole system at once; it does not detract from the principle of systematisation in the least. [12] This notion of system makes it clear why pure and applied mathematics have constantly been held up as the methodological model and guide for modern philosophy. For the way in which their axioms are related to the partial systems and results deduced from them corresponds exact to the postulate that systematic rationalism sets itself, the postulate, namely, that every given aspect of the system should be capable of being deduced from its basic principle, that it should be exactly predictable and calculable It is evident that the principle of systematisation is not reconcilable with the recognition of any ' facticity,, of a'content'which in principle cannot be deduced from the principle of form and which, therefore, has simply to be accepted as actuality. The greatness, the paradox and the tragedy of classical German philosophy lie in the fact that-unlike Spinoza-it no longer dismisses every given [donne] as non-existent, causing it to vanish behind the monumental architecture of the rational forms produced by the understanding. Instead, while grasping and holding on to the irrational character of the actual contents of the concepts it strives to go beyond this, to overcome it and to erect a system. But from what has already been said it clear what the problem of the actually given means for rationalism: viz. that it cannot be left to its own being and existence, for in that case it would remain ineluctably contingent Instead it must be wholly absorbed into the rational system of the concepts of the At first sight we seem to be faced by an insoluble dilemma For either the irrational content is to be wholly integrated into the conceptual system, i. e. this is to be so constructed that it can be coherently applied to everything just as if there were no irrational content or actuality (if there is, it exists at best as a problem in the sense suggested above). In this event thought regresses to the level of a naive, dogmatic rationalism: somehow it regards the mere actuality of the irrational contents of the concepts as nonexistent. (This metaphysics may also conceal its real nature behind the formula that these contents are irrelevant to knowledge Alternatively we are forced to concede that actuality, content, matter reaches right into the form, the structures of the forms and their interrelations and thus into the structure of the system itself. [13] In that case the system must be abandoned as a system. For then it will be no more than a register, an account, as well ordered as possible, of facts which are no longer linked rationally and so can no longer be made systematic even though the forms of their components are themselves rational. [14 It would be superficial to be baffled by this abstract dilemma and the classical philosophers did not hesitate for a moment. They took the logical opposition of form and content, the point at which all the antitheses of philosophy meet, and drove it to extremes. This enabled them to make a real advance on their predecessors and lay the foundations of the dialectical method They persisted in their attempts to construct a rational system in the face of their clear acknowledgment of and stubborn adherence to the irrational nature of the contents of their concepts(of the given world)(and within these, of the individual forms). The connections between them must always be thought of as ‘necessary’, i.e. as visible in or ‘created ‘by the forms themselves, or at least by the principle according to which forms are constructed. That is to say, the correct positing of a principle implies – at least in its general tendency – the positing of the whole system determined by it; the consequences are contained in the principle, they can be deduced from it, they are predictable and calculable. The real evolution of the totality of postulates may appear as an ‘infinite process’, but this limitation means only that we cannot survey the whole system at once; it does not detract from the principle of systematisation in the least. [12] This notion of system makes it clear why pure and applied mathematics have constantly been held up as the methodological model and guide for modern philosophy. For the way in which their axioms are related to the partial systems and results deduced from them corresponds exactly to the postulate that systematic rationalism sets itself, the postulate, namely, that every given aspect of the system should be capable of being deduced from its basic principle, that it should be exactly predictable and calculable. It is evident that the principle of systematisation is not reconcilable with the recognition of any ‘facticity’, of a ‘content’ which in principle cannot be deduced from the principle of form and which, therefore, has simply to be accepted as actuality. The greatness, the paradox and the tragedy of classical German philosophy lie in the fact that – unlike Spinoza – it no longer dismisses every given [donné] as non-existent, causing it to vanish behind the monumental architecture of the rational forms produced by the understanding. Instead, while grasping and holding on to the irrational character of the actual contents of the concepts it strives to go beyond this, to overcome it and to erect a system. But from what has already been said it is clear what the problem of the actually given means for rationalism: viz. that it cannot be left to its own being and existence, for in that case it would remain ineluctably ‘contingent’. Instead it must be wholly absorbed into the rational system of the concepts of the understanding. At first sight we seem to be faced by an insoluble dilemma. For either the ‘irrational’ content is to be wholly integrated into the conceptual system, i.e. this is to be so constructed that it can be coherently applied to everything just as if there were no irrational content or actuality (if there is, it exists at best as a problem in the sense suggested above). In this event thought regresses to the level of a naïve, dogmatic rationalism: somehow it regards the mere actuality of the irrational contents of the concepts as nonexistent. (This metaphysics may also conceal its real nature behind the formula that these contents are ‘irrelevant’ to knowledge.) Alternatively we are forced to concede that actuality, content, matter reaches right into the form, the structures of the forms and their interrelations and thus into the structure of the system itself. [13] In that case the system must be abandoned as a system. For then it will be no more than a register, an account, as well ordered as possible, of facts which are no longer linked rationally and so can no longer be made systematic even though the forms of their components are themselves rational. [14] It would be superficial to be baffled by this abstract dilemma and the classical philosophers did not hesitate for a moment. They took the logical opposition of form and content, the point at which all the antitheses of philosophy meet, and drove it to extremes. This enabled them to make a real advance on their predecessors and lay the foundations of the dialectical method. They persisted in their attempts to construct a rational system in the face of their clear acknowledgment of and stubborn adherence to the irrational nature of the contents of their concepts (of the given world)