We can see nothing whatever of the soul unless it is visible in the expression of the countenance; one might call the faces at a large assembly of people a history of the human soul written in a kind of Chinese ideograms.

Imagine the world so greatly magnified that particles of light look like twenty-four-pound cannon balls.

How did mankind ever come by the idea of liberty? What a grand thought it was!

To grow wiser means to learn to know better and better the faults to which this instrument with which we feel and judge can be subject.

Some theories are good for nothing except to be argued about.

One might call habit a moral friction: something that prevents the mind from gliding over things but connects it with them and makes it hard for it to free itself from them.

Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.