质量从来不是偶然的；它始终是智慧努力的结果。

反射是神经活动最简单和最常见的形式。

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.

真相不是被发现，而是被创造的。