The worth of a psychological theory is measured by its usefulness.
过去是一个陌生的国度;那里的人们行事方式不同。
The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
研究中国古典文学不仅是一种学术追求,更是理解中国文化灵魂的一种方式。