您认为自己知道什么时候可以学习，更确定什么时候可以写作，甚至更多的时候可以教书，但是可以确定何时可以编程。
You think you know when you can learn, are more sure when you can write, even more when you can teach, but certain when you can program.
The essence of science is not to complicate the simple, but to simplify the complex.
A journey is a person in itself; no two are alike. And all plans, safeguards, policing, and coercion are fruitless. We find after years of struggle that we do not take a trip; a trip takes us.