有些难过和痛苦是言语无法抚平的。悲伤，是我们为爱付出的代价。
The stranger is an element of the group itself, not unlike the poor and sundry 'inner enemies'—an element whose membership within the group involves both being outside it and confronting it.
我们这个时代的巨大挑战是建立能够管理现代社会复杂性的机构。
He was a man who had always been too proud to ask for help, and now he was too proud to accept it.
数学不仅仅是关于数字，而是关于模式、结构和关系。
【译文】 孔子说：“陪君子说话要注意三种毛病：没到说的时候就说，叫做急躁；到该说的时候不说，叫做隐瞒；不顾对方的表情就说，叫做睁眼瞎。”
The best time to plant a tree was 20 years ago. The second-best time is now.