The best way to learn mathematics is to do mathematics.
本当の強さとは、弱さを認めることだ。
Even if I knew that tomorrow the world would go to pieces, I would still plant my apple tree.
Challenges are opportunities in disguise—embrace them.
I am not young enough to know everything.
让孩子笑的最好方法就是像对待大人一样对待他们。
心灵是一个动态的过程系统。