Experience praises the most happy the one who made the most people happy.

In a word, the free trade system hastens the social revolution. It is in this revolutionary sense alone, gentlemen, that I vote in favor of free trade.

Communism deprives no man of the ability to appropriate the fruits of his labour. The only thing it deprives him of is the ability to enslave others by means of such appropriations.

You will have to go through 15, 20, 50 years of civil wars and national struggles not only to bring about a change in society but also to change yourselves, and prepare yourselves for the exercise of political power.

Darwin has interested us in the history of nature's technology.

I am a machine, condemned to devour them and then, throw them, in a changed form, on the dunghill of history.

Scientific truth is always paradox, if judged by everyday experience, which catches only the delusive appearance of things.