Thirty five is a very attractive age; London society is full of women who have of their own free choice remained thirty-five for years.

Happiness is brief. It will not stay. God batters at its sails.

The essence of mathematics is not just in solving problems but in asking the right questions.

用心才能明白道理，而用心要保持虚空、专一而安静。荀子认为，人们在以前已经学到了一些知识的情况下，再学新东西的时候，容易犯经验主义的错误。生活中也是这样，我们在遇到一件事时，总是容易按以往的经验去判断，这样可能是错的。最好能保持虚空的状态，专心地看待这件事，然后可以想想是否可以借鉴以往的经验。