习俗并非任何协议或契约的结果，而是长期发展过程的产物，在此过程中它们适应了社会的生活条件。
The interpretation of our reality through patterns not our own serves only to make us ever more unknown, ever less free, ever more solitary.
出自唐代百丈禅师怀海的《无题》，意思是面对一切的人、事、地、物，有缘分就留下来，没有缘分就离开；就像在清风吹拂下的白云一样轻轻随风漂浮，悠闲自在，没有非如此不可的执著。
The concept of NP-completeness has provided a powerful tool for understanding the complexity of computational problems.
That is the outstanding answer I've ever heard.
