If you want to be successful, surround yourself with people who challenge you.
如果你想成功，就要和那些能挑战你的人在一起。
The best way to learn mathematics is to do mathematics.
合抱的大树由细小的幼苗长成，九层的高台由一筐筐泥土堆起，千里远行从脚下第一步开始
Coal keeps America competitive in the world.
The truth is not always beautiful, nor beautiful words the truth.
A verdadeira viagem de descobrimento não consiste em procurar novas paisagens, mas em ter novos olhos.