The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.

Here's where it makes the most sense. You need it so you don't forget. Forget that there are palace in the world that aren't made out of stone That there's a---there's a---there's something inside that's yours, that they can't touch.

The world is like a chessboard， whereon we may see a living knight， but we cannot see a living chess.

好奇心是所有科学发现的驱动力。

文学的真正价值在于其提升人类精神的力量。

它们难分彼此，交相辉映。