Karl Marx — "The working class is revolutionary or it is nothing."

"The development of productive forces has reached a point where the existence of private property and the bourgeoisie are incompatible with further social development."

"All that is solid melts into air, all that is holy is profaned, and man is at last compelled to face with sober senses his real conditions of life, and his relations with his kind."

"The meaning of peace is the absence of opposition to socialism."

"The modern ancien régime is rather only the comedian of a world order whose true heroes are dead."

"Communism begins where atheism begins."