过去是一个幽灵，萦绕在现在。
Every mathematical problem is a window into a deeper understanding of the world.
The most important thing I have learned is that the best way to get something done is to begin.
"我不害怕死亡，我害怕生活。"
"Power is never innocent, and innocence is never powerful."
Technology should serve the forest, not dominate it.