A good abstraction is one that emphasizes the essential and suppresses the irrelevant.
这个世界极其危险、不可信任、不可靠。
To live is to be in constant dialogue with the world.
你无法回到过去改变开头，但你可以从现在开始改变结局。
Technology is nothing. What's important is that you have a faith in people, that they're basically good and smart, and if you give them tools, they'll do wonderful things with them.