The best preparation for tomorrow is doing your best today.

A true friend is someone who sees the pain in your eyes while everyone else believes the smile on your face.

The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.

The best way to predict the future is to create it.

The only way to do great work is to love what you do.

在解释行为时，意志的概念是不必要的。