如果没有冬天的寒冷来赋予它甜蜜，夏天的温暖又有什么意义呢？
What good is the warmth of summer, without the cold of winter to give it sweetness.
It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to than I have ever known.
世界是生者的地方，死者在其中没有位置。死者什么都不是。他们甚至不是记忆。他们被遗忘了。
Never let failure define you. Use it as a stepping stone to something better.
一个好的数学问题的定义是它产生的数学，而不是问题本身。
社会系统是个人与个人之间、群体与群体之间关系的网络。