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.

我不把任何事情视为理所当然。现在我只有好日子，或伟大的日子。

你没有第二次机会。生活不是任天堂游戏。

晏子春秋

The greatest happiness is to know the source of unhappiness.

数学中的每个问题都是一个等待解决的谜题，而乐趣就在于解决的过程。