The unity of the bourgeoisie can be shaken only by the unity of the proletariat.

Our epoch, the epoch of the bourgeoisie, posses however, this distinctive feature; it has simplified the class antagonisms. Society as a whole is more and more splitting up into two great hostile camps, into two great classes directly facing each other.

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.

There must be something rotten in the very core of a social system which increases its wealth without diminishing its misery

The task is not just to understand the world but to change it.

The true law of economics is chance, and we learned people arbitrarily seize on a few moments and establish them as laws.

Men's ideas are the most direct emanations of their material state.