书是一份你可以反复打开的礼物。
The only person who can pull me down is myself, and I'm not going to let myself pull me down anymore.
In mathematics, the journey from confusion to clarity is the most rewarding experience.
The truth is rarely pure and never simple.
Dealing with failure is easy: Work hard to improve. Success is also easy to handle: You've solved the wrong problem. Work hard to improve.
His back’s as crooked as a politician.