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

“Each department of knowledge passes through three stages. The theoretic stage the theological stage and the metaphysical or abstract stage.”

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

“Every science consists in the coordination of facts; if the different observations were entirely isolated, there would be no science.”

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

“Foresight of phenomenon and power over them depend on knowledge of their sequences, and not upon any notion we may have formed respecting their origin or inmost nature.”