The true method of knowledge is experiment.

Humility and knowledge in poor clothes excel pride and ignorance in costly attire.

Reading furnishes the mind only with materials of knowledge it is thinking that makes what we read ours.

As the biggest library if it is in disorder is not as useful as a small but well-arranged one, so you may accumulate a vast amount of knowledge but it will be of far less value than a much smaller amount if you have not thought it over for yourself.

The only good is knowledge, and the only evil is ignorance.