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

History always repeats itself twice: first time as tragedy, second time as farce.

The philosophers have only interpreted the world, in various ways; the point is to change it

All science would be superfluous if the outward appearance and the essence of things directly coincided. Das Capitol, Vol III, Ch.48

Philosophy is to the real world as masturbation is to sex

Philosophy stands in the same relation to the study of the actual world as masturbation to sexual love.