The best books are the ones that challenge you.
最好的书是那些挑战你的书。
All the other children at my school are stupid. Except I’m not meant to call them stupid, even though this is what they are.
你最好的工作将是那些你不太胜任的，因为它会促使你去挑战自我。实际上，你只应该申请那些你不太胜任的工作。
The joy of solving a mathematical problem is unparalleled; it is a moment of pure intellectual triumph.