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.

Leadership means making tough decisions today that will shape a better tomorrow.

No man or woman is worth your tears， and the one who is， won‘t make you cry。

The joy of mathematics comes from the struggle to understand.

文学是一种理解世界的方式，是在混乱中找到意义，在无意义中找到意义。

为了如今仰望太空，注视月球和遥看繁星的人们，我们发誓，我们决不允许太空被那些敌对国家（原文为旗帜）所征服，我们会看到自由与和平的旗帜在飘扬。（1962年我们选择登月演说）

解释：信任是百姓、国家赖以生存的根基，不能失信于民。