“The same ‘practical’ viewpoint is dominant in Marx’s conception of the cognitive functions of the mind and its role in the historical process; ‘practical’ is always regarded as implying ‘social’, and ‘social life is practical by its very essence’. So is the task of philosophy as defined in the eleventh Thesis, in what are perhaps Marx’s most-quoted words: ‘The philosophers have only interpreted the world in various ways; the point, however, is to change it.’ It would be a caricature of Marx’s thought to read this as meaning that it was not important to observe or analyse society and that only direct revolutionary action mattered. The whole context shows that it is a formula expressing in a nutshell the viewpoint of ‘practical philosophy’ as opposed to the ‘contemplative’ attitude of Hegel or Feuerbach – the viewpoint which Hess, and through him Cieszkowski, suggested to Marx and which became the philosophical nucleus of Marxism. To understand the world does not mean considering it from outside, judging it morally or explaining it scientifically; it means society understanding itself, an act in which the subject changes the object by the very fact of understanding it. (pp. 143-4)”
