After completing "German Ideology", Marx turned to a work that was intended to clarify his own position regarding "the theory and tactics" of a truly "revolutionary proletarian movement" operating from the standpoint of a truly "scientific materialist" philosophy. This work was intended to draw a distinction between the utopian socialists and Marx's own scientific socialist philosophy. Whereas the utopians believed that people must be persuaded one person at a time to join the socialist movement, the way a person must be persuaded to adopt any different belief, Marx knew that people would tend, on most occasions, to act in accordance with their own economic interests, thus appealing to an entire class (the working class in this case) with a broad appeal to the class's best material interest would be the best way to mobilise the broad mass of that class to make a revolution and change society. This was the intent of the new book that Marx was planning, but to get the manuscript past the government censors he called the book "The Poverty of Philosophy" (1847) and offered it as a response to the "petty-bourgeois philosophy" of the French anarchist socialist Pierre-Joseph Proudhon as expressed in his book "The Philosophy of Poverty" (1840).