数学不知道种族或地理界限;对于数学来说,文化世界是一个国家。
Every book is the wreck of a perfect idea.
Hope is a good thing, maybe the best of things, and no good thing ever dies.
过去并未死去,它甚至还未过去。
学习的过程本质上是一个形成关联的过程。
Read not to contradict and confute; nor to believe and take for granted; nor to find talk and discourse; but to weigh and consider.