If economists could manage to get themselves thought of as humble， competent people on a level with dentists， that would be splendid.

Optimism is a learned skill. Once you learn it, you can improve your life in every way.

做得越多，学得越多；学得越多，能做的就越多。

The capacity of the human mind for forming and manipulating symbols is what sets us apart from other animals.

发现可能性的极限的唯一方法，就是超越它们进入不可能。