Man is his own worst enemy.

We should not be so taken up in the search for truth, as to neglect the needful duties of active life; for it is only action that gives a true value and commendation to virtue.

Not in opinion but in nature is law founded.

Before beginning, prepare carefully.

They are, all of them, born with raging fanaticism in their hearts, just as the Bretons and the Germans are born with blond hair. I would not be in the least bit surprised if these people would not some day become deadly to the human race.

It is difficult to persuade mankind that the love of virtue is the love of themselves.

There is no more sure tie between friends than when they are united in their objects and wishes.