History is not the past. It is the method we have evolved of organizing our ignorance of the past.
知道自己不知道什么比聪明更有用。
真理如同金子,不是靠它的增长,而是靠洗去一切不是金子的东西来获得。
在数学中,提出问题的艺术必须比解决问题更有价值。
The old believe everything; the middle-aged suspect everything; the young know everything.
"Life is what happens when you're busy making other plans."