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.

Mathematics is the most beautiful and most powerful creation of the human spirit.

成功的关键是将我们的意识集中在我们所渴望的事情上，而不是我们所害怕的事情上。