Stalin: Further, if development proceeds by way of the disclosure of internal contradictions, by way of collisions between opposite forces on the basis of these contradictions and so as to overcome these contradictions, then it is clear that the class struggle of the proletariat is a quite natural and inevitable phenomenon. Hence, we must not cover up the contradictions of the capitalist system, but disclose and unravel them; we must not try to check the class struggle but carry it to its conclusion. Hence, in order not to err in policy, one must pursue an uncompromising proletarian class policy, not a reformist policy of harmony of the interests of the proletariat and the bourgeoisie, not a compromisers' policy of the "growing" of capitalism into socialism. Such is the Marxist dialectical method when applied to social life, to the history of society. As to Marxist philosophical materialism, it is fundamentally the direct opposite of philosophical idealism. https://wordsmith.social/protestation/quotes#quote5835