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.

5. On religion

Khalil Hamra/AP
An Egyptian woman attends Friday prayers before a rally in Tahrir Square to denounce the presidential candidacies of Hosni Mubarak-era officials, in April, 2012.

"Religious suffering is, at one and the same time, the expression of real suffering and a protest against real suffering. Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people." (From the "Introduction to the Critique of Hegel's Philosophy of Right," 1843)

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