The challenge in theoretical computer science is not just to solve problems, but to understand the nature of problem-solving itself.

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.

Time has no divisions to mark its passage, there is never a thunderstorm or blare of trumpets to announce the beginning of a new month or year.

In the depth of the valley is the road to salvation.

我们不是从祖先那里继承了地球；我们是从子孙那里借来的——这必须指导每一个商业决策。