理论物理学之于数学，犹如雕塑之于几何学。

For every expert there is an equal and opposite expert, but for every fact there is not necessarily an equal and opposite fact.

The tyranny of a prince in an oligarchy is not so dangerous to the public welfare as the apathy of a citizen in a democracy.

解释：教化不好，国政就难以治理。指治国治民，教化为先。