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。

On the path of science, there are no smooth roads to take; only those who are not afraid of hard work and climb the steep mountain paths have the hope of reaching the glorious summit.

Sustainability isn't an option; it's a necessity for the future of our industry.

数学语言是通用的；它超越了所有文化障碍。