Pragmatism starts from assumptions similar to those of empiriocriticism, but differs from the latter by its striking formulations, loose aphorisms, a… - Leszek Kołakowski

Marx sees Epicurus as a destroyer of the Greek myths and as a philosopher bringing to light the break-up of a tribal community. His system destroyed the visible heaven of the ancients as a keystone of political and religious life. Marx allies himself, so to speak, with Epicurean atheism, which he regards at this stage as a challenge by the intellectual élite to the cohorts of common sense. ‘As long as a single drop of blood pulses in her world-conquering and totally free heart, philosophy will continually shout at her opponents the cry of Epicurus: “Impiety does not consist in destroying the gods of the crowd but rather in ascribing to the gods the ideas of the crowd.”’ (pp. 102-3)

But the philosophy that killed off truth proclaims unlimited tolerance for the "language games" (i.e., opinions, beliefs and doctrines) that people find useful. The outcome is expressed in the words of Karl Kraus: "Alles ist wahr und auch das Gegenteil." "Everything is true, and also its opposite."

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)