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paper, scribbling down thoughts as they occurred to him, and a surviving page from his Kreuznach notebooks shows the process in action:
    Note . Under Louis XVIII, the constitution by grace of the king (Charter imposed by the king); under Louis Philippe, the king by grace of the constitution (imposed kingship). In general we can note that the conversion of the subject into the predicate, and of the predicate into the subject, the exchange of that which determines for that which is determined, is always the most immediate revolution. Not only on the revolutionary side. The king makes the law (old monarchy), the law makes the king (new monarchy).
    Once Marx had started on one of these riffs, playing with his beloved contradictions, there was no stopping him. Mightn’t the simple grammatical inversion that turned old monarchs into new also explain where German philosophy had gone wrong? Hegel, for instance, had assumed that ‘the Idea of the State’ was the subject, with society as its predicate, whereas history showed the reverse to be the case. There was nothing wrong with Hegel that couldn’t be cured by standing him on his head: religion does not make man, man makes religion; the constitution does not create the people, but the people create the constitution. Top down and bottom up, it all made perfect sense.
    The credit for this discovery belongs to the German philosopher Ludwig Feuerbach, whose Introductory Theses to the Reform of Philosophy had been published in March 1843. ‘Being is subject, thought predicate,’ he argued. ‘Thought arises from being, not being from thought.’ Marx stretched the logic much further by extending it from abstract philosophy to the real world – above all, the world of politics, the state and society. Feuerbach, a formerpupil of Hegel, had already travelled quite a distance from his mentor’s idealism towards materialism (his most memorable aphorism, still to be found in dictionaries of quotations, was ‘Man is what he eats’); but it was a studiously cerebral materialism, unrelated to the social and economic conditions of his time or place. Marx’s foray into journalism had convinced him that radical philosophers shouldn’t spend their lives atop a lofty pillar like some ancient Greek anchorite; they must come down and engage with the here and now.
    Feuerbach was one of the first writers from whom Marx solicited a contribution to the Deutsche-Französische Jahrbücher as soon as he knew that its publication was assured. On 3 October 1843, just before setting off to join Ruge in Paris, he wrote to suggest a demolition job on the Prussian court philosopher F. W. von Schelling, his old antagonist from Berlin University. ‘ The entire German police is at his disposal , as I myself experienced when I was editor of the Rheinische Zeitung . That is, a censorship order can prevent anything against the holy Schelling from getting through … But just imagine Schelling exposed in Paris, before the French literary world! … I confidently expect a contribution from you in the form you may find most convenient.’ As further enticement, he added a cheeky postscript: ‘Although she does not know you, my wife sends greetings. You would not believe how many followers you have among the fair sex.’
    Feuerbach was not seduced. He replied that, in his opinion, it would be rash to move from theory to practice until the theory itself had been honed to perfection. Marx, by contrast, believed the two were – or ought to be – inseparable. Praxis makes perfect, and the most necessary practice for philosophers at this time was ‘merciless criticism of all that exists’. The critique of Hegel had been inspired by Feuerbach; now Feuerbach himself, having served his purpose, must expect to be criticised in turn – most notably in the Theses on Feuerbach , written in the spring of 1845, which conclude with the most succinct summary of the difference between anchorites and activists: ‘The