When people talk, listen completely. Most people never listen.

"The most important single aspect of software development is to be clear about what you are trying to build."

The world is so beautiful and regretful, you and I are all lone travelers from afar, constantly walking, regardless of everything, crying, laughing, lingering in the world, just to make this trip worthwhile.

No arts; no letters; no society; and which is worst of all, continual fear, and danger of violent death; and the life of man, solitary, poor, nasty, brutish, and short.

数学的目标不是解决问题，而是理解问题。