"Too great seriousness is the most ludicrous thing of all, and too great modesty is the bitterest irony."

"The first step in the revolution by the working class is to raise the proletariat to the position of ruling class to win the battle of democracy."

"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."

"While the miser is merely a capitalist gone mad, the capitalist is a rational miser."

"The free development of each is the condition for the free development of all."