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 secret of happiness is freedom, and the secret of freedom is courage.

The test of a man or woman's breeding is how they behave in a quarrel.

我表演不是为了逃避现实；我表演是为了更好地理解它。

Your life changes the moment you make a new, congruent, and committed decision.

数学是一门活生生的学科，随着新的思想和发现不断演变。