做决定是困难的，也因此益发珍贵

一本好书是作者与读者之间的对话。

心理学概念必须在行动中证明其价值。

I always try to be positive, even in difficult moments.

I went to the woods because I wanted to live deliberately. I wanted to live deep and suck out all the marrow of life. To put to rout all that was not life. And not, when I had come to die, discover that I had not lived.

Modularity based on abstraction is the way things ought to be done.