年轻人并不堕落；他们只有在成年人已经堕落时才会被宠坏。
A good mathematician is always ready to generalize.
The body is a map of all our journeys.
Happiness is not something ready made. It comes from your own actions.
Knowledge can be shared, but wisdom cannot. It must be discovered and lived.
每一个挑战都是成长的机会。