The pleasures of the imagination are as it were only drawings and models which are played with by poor people who cannot afford the real thing.

It is too bad if you have to do everything upon reflection and can't do anything from early habit.

The fruits of philosophy are the important thing, not the philosophy itself. When we ask the time, we don't want to know how watches are made.

If all mankind were suddenly to practice honesty, many thousands of people would be sure to starve.

Doubt must be no more than vigilance, otherwise it can become dangerous.

It often takes more courage to change one's opinion than to stick to it.

Libraries can in general be too narrow or too wide for the soul.