千锤万凿出深山，烈火焚烧若等闲。粉骨碎身浑不怕，要留清白在人间。
译文：从深山里开采出来，经过千锤百炼，烈火焚烧也毫不在乎。就算粉身碎骨也不怕，只为在世上留下清白的名声。
活着就是留下痕迹，而诗歌是所有痕迹中最持久的
经验是我们给错误起的名字。
The most important skill in mathematics is the ability to ask the right questions.
The human being cannot live in a condition of emptiness for very long: if he is not growing toward something, he does not merely stagnate; the pent-up potentialities turn into morbidity and despair, and eventually into destructive activities.
I don't rap for dead presidents. I'd rather see the president dead.
系统辨识的挑战不仅在于拟合数据，还在于提取有意义且可推广的模型。