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.

The past is not a line but a landscape.

在科学研究中，坚持比才华更重要。

The laws of behavior can be derived from basic physiological principles.

"The moment you doubt whether you can fly, you cease for ever to be able to do it."

解释：两虎相斗而劣狗趁机得到好处。

你越是赞美和庆祝你的生活，生活中就越有值得庆祝的东西。