我不是天才。我只是努力工作，永不放弃。

"The difference between a happy marriage and a miserable one... consists of about ten continued acts of stupidity or kindness, depending on the direction."

"Books can be mirrors, windows, and sliding glass doors."

The study of mind is the study of adaptive behavior.

The most important political development of the modern era is the rise of the modern state.

未来は誰にもわからない。だからこそ、今を大切に生きるべきだ。