在数学中，从困惑到清晰的旅程是最有价值的体验。
In mathematics, the journey from confusion to clarity is the most rewarding experience.
The most important skill for a programmer is the ability to read code.
Life is a long farewell.
Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.
The purpose of mental activity is to guide action.