" 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 masses. "
" The abolition of religion as the illusory happiness of the people is the demand for their real happiness. To call on them to give up their illusions about their condition is to call on them to give up a condition that requires illusions. "
" Religion is, indeed, the self-consciousness and self-esteem of man who has either not yet won through to himself, or has already lost himself again. "
" Religion is the general theory of this world, ...and its universal basis of consolation and justification. "
" Religion is only the illusory Sun which revolves around man as long as he does not revolve around himself. "