Religion is an illusion of childhood, outgrown under proper education.

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

Men are not allowed to think freely about chemistry and biology: why should they be allowed to think freely about political philosophy?

Woman is the most moral element in all humanity.

The law is this: that each of our leading conceptions-each branch of our knowledge-passes successively through three different theoretical conditions: the Theological, or fictitious: the Metaphysical, or abstract; and the Scientific, or positive.

All good intellects have repeated, since Bacon's time, that there can be no real knowledge but which is based on observed facts.

Know yourself to improve yourself.