学习数学的唯一方法就是做数学。
The only way to learn mathematics is to do mathematics.
If a listener nods his head when you're explaining your program, wake him up.
The American dream is powered by American energy.
学习是系统中产生的任何变化，这些变化或多或少会永久性地改变其适应环境的能力。
"Experience is merely the name men gave to their mistakes."
读经书，阅传注，就为治学打下坚实基础；看史籍，鉴古今，就使宏论滔滔切中肯綮；游山川，观壮景，就使志气凌云眼界开阔；戒嗜好，弃私欲，就使胸怀磊落一尘不染。