I am from there. I am from here. I am not there and I am not here.
"To be useful was the best thing the old men ever hoped for themselves, and to be aimless was their worst fear."
The best investment you can make is in yourself.
数学之美不仅在于它描述世界的能力，还在于它揭示支配世界的隐藏结构的力量。
领导力在于因你的存在而使他人变得更好，并确保这种影响在你不在时仍持续。