You cannot open a book without learning something.

Satisfaction consists in freedom from pain, which is the positive element of life.

The difference between stupidity and genius is that genius has its limits.

Having knowledge but lacking the power to express it clearly is no better than never having any ideas at all.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

Knowledge is power. Information is liberating. Education is the premise of progress, in every society, in every family.

Education is the passport to the future, for tomorrow belongs to those who prepare for it today.

Never, never, never give up.

Knowledge is knowing that we cannot know.

Experience without theory is blind, but theory without experience is mere intellectual play.