The concept of law is essentially a matter of social fact.
The world is given to me only once, not one existing and one perceived.
经验的直接内容是心理学必须考虑的唯一事实。
Investing in people is the most valuable investment a company can make.
数学的研究就像空气或重力——它无处不在,你看不到它,但你知道它在那里。