In his presentation of Marx’s Theses on Feuerbach (1845), which he published posthumously in 1888, Engels described them as “the first document in which is deposited the brilliant germ of the new world outlook”. Indeed, in this little text Marx surpasses dialectically – the celebrated Aufhebung: negation/conservation/elevation – the preceding materialism and idealism, and formulates a new theory, which we could describe as the philosophy of praxis. While the French materialists of the eighteenth century insisted on the need to change material circumstances so that human beings could change, the German idealists affirmed that, thanks to the formation of a new consciousness of individuals, society would be changed.