孩子们值得拥有挑战他们的书，而不仅仅是娱乐。
不理解一个人，就往往会把他当成傻瓜。
The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.
A culture of experimentation and learning is essential for growth.