To understand a science, it is necessary to know its history.

Know yourself to improve yourself.

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.

Ideas govern the world, or throw it into chaos.

The sacred formula of positivism: love as a principle, the order as a foundation, and progress as a goal.