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The natural scientist must be a modern materialist, a conscious adherent of the materialism represented by Marx, i.e., he must be a dialectical materialist.

"On the Significance of Militant Materialism". Pod Znamenem Marksizma No. 3. Collected Works, Vol. 33, pp. 227-236, www.marxists.org.
The natural scientist must be a modern materialist, a conscious adherent of the materialism represented by Marx, i.e., he must be a dialectical materialist.