Religious suffering is at once the expression of real suffering and a protest against real suffering. Religion is the sigh of the oppressed creature, the sentiment of the heartless world, as it is the soul of soulless condition. It is the opium of the people.

Political activism
Arriving in Cambridge as a Catholic Bernal became a socialist as a result of a long night arguing with a friend. (1965). 0143.

John Desmond Bernal[pronunciation?]FRS (10 May 1901 – 15 September 1971) was one of the United Kingdom's most well-known and controversial scientists.