The best way to create interest in a subject is to render it worth knowing, which means to make the knowledge usable.

To be one, to be united is a great thing. But to respect the right to be different is maybe even greater.

Find more pleasure in intelligent dissent than in passive agreement, for, if you value intelligence as you should, the former implies a deeper agreement than the latter.

No man's knowledge here can go beyond his experience.

遇事要再三考虑，慎重行事，第一重要的是不要自欺欺人。