人生的真正意义在于种树,而不期待坐在树荫下。
The true meaning of life is to plant trees, under whose shade you do not expect to sit.
Change is the essence of life. Be willing to surrender what you are for what you could become.
We think in order to act, and act in order to live.
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.