Philosophy stands in the same relation to the study of the actual world as masturbation to sexual love.
Karl MarxThe entire so-called history of the world is nothing but the creation of man through human labor.
Karl MarxThe imaginary flowers of religion adorn man's chains. Man must throw off the flowers, and also the chains.
Karl MarxNature 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.
Karl Marx