Know yourself to improve yourself.
To understand a science, it is necessary to know its history.
The only real life is the collective life of the race; individual life has no existence except as an abstraction.
Ideas govern the world, or throw it into chaos.
Demography is destiny.
Every science consists in the coordination of facts; if the different observations were entirely isolated, there would be no science.
Indeed, every true science has for its object the determination of certain phenomena by means of others, in accordance with the relations which exist between them.
Each department of knowledge passes through three stages. The theoretic stage; the theological stage and the metaphysical or abstract stage.
The word 'right' should be excluded from political language, as the word 'cause' from the language of philosophy.
