One has to 'leave philosophy aside,' one has to leap out of it and devote oneselflike an ordinary man to the study of actuality . . . Philosophy and the study of the actual world have the same relation to one another as masturbation and sexual love.

Greek philosophy seems to have met with something with which a good tragedy is not supposed to meet, namely, a dull ending.

Nothing can have value without being an object of utility.

The theory of Communism may be summed up in one sentence: Abolish all private property.

Philosophy is to the real world as masturbation is to sex

In the eyes of dialectical philosophy, nothing is established for all times, nothing is absolute or sacred.