The only limit to our realization of tomorrow will be our doubts of today.

模型最重要的不是其假设，而是其结论。

"History is not what happened but what survives the shipwreck."

Freedom is the right to live as we wish.

A person may cause evil to others not only by his actions but by his inaction， and in either case， he is justly accountable to them for the injury.

The true value of a mathematical theory lies in its ability to connect seemingly unrelated ideas.