He walked out in the gray light and stood and he saw for a brief moment the absolute truth of the world. The cold relentless circling of the intestate earth. Darkness implacable. The blind dogs of the sun in their running. The crushing black vacuum of the universe. And somewhere two hunted animals trembling like ground-foxes in their cover. Borrowed time and borrowed world and borrowed eyes with which to sorrow it.

For poise, walk with the knowledge that you never walk alone.

我想，很多大公司的领导人都不相信坚持改变才是企业的出路。但如果你回顾历史，你会发现事物一直在改变，如果你的事业是稳定的，那你可能是有问题的。

书是你握在手中的一个梦。

每一个词都是通向理解的一步。

The night is a great teacher, but few are willing to learn.

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。