Karl Marx: 10 great quotes on his birthday

May 5 marks the birthday of Karl Marx, who provided intellectual foundation for an array of regimes that at one time governed nearly half of Earth's population.

10. On Marxism

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    Activist of Sri Lanka's Marxist political party, the People's Liberation Front push carts with portraits of Communist leaders, from left, Karl Marx, Friedrich Engels, Vladimir Lenin and Rohana Wijeweera during a street march to celebrate May Day in Colombo, Sri Lanka, in 2012.
    Gemunu Amarasinghe/AP
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"If anything is certain, it is that I myself am not a Marxist." (Quoted by Friedrich Engels, in a letter to Eduard Bernstein, 1882)

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