自由比平等重要。实现平等的企图危及了自由。如果失去了自由，就连在不自由的人中间也不会有平等。
"I am not interested in the beautiful, I am interested in the true."
The permanence of certain urban artifacts gives them the quality of monuments.
从n对观测值的样本中获得的相关系数的可能误差是sqrt((1-r²)/(n-2))。
If you want people to do something, make it easy.
读书人虽然有学问，但只有知行合一，把学问付诸于生活实践，才是最根本的。否则的话，就是《弟子规》上讲的“不力行，但学文，长浮华，成何人”了。
I think the greatest thing in life is to be able to give back.