We are here to add what we can you to life，not to get what we can from it.

Freedom is what you do with what's been done to you.

When I got to 40 or so... I had the sense when I looked back over my life I would actually see a mess of decisions， a few of which I had thought about， some of which I had sort of stumbled on， and many that I had no control over whatsoever.

Any problem in computer science can be solved with another layer of indirection.

消化道是一条穿过整个生物体的管道。