Nature is man's inorganic body -- that is to say, nature insofar as it is not the human body. Man lives from nature -- i.e., nature is his body -- and he must maintain a continuing dialogue with it is he is not to die. To say that man's physical and mental life is linked to nature simply means that nature is linked to itself, for man is a part of nature.

The English have all the material requisites for the revolution. What they lack is the spirit of generalization and revolutionary ardour.

The world will be for the common people, and the sounds of Happiness will reach even the deepest springs.

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.

Art is always and everywhere the secret confession, and at the same time the immortal movement of its time.

The proletarians have nothing to loose but their chains. They have a world to win.

Religion is the impotence of the human mind to deal with occurrences it cannot understand.