心是脆弱的，但它也是我们最伟大力量的源泉。

改变始于决定，但靠行动维持。

The improvement of the productive powers of labor, and the greater part of the skill, dexterity, and judgement with which it is anywhere directed or applied, seem to have been the effects of division of labor.

性能的关键在于优雅，而不是大量的特殊情况。

In mathematics, the journey of discovery is as important as the destination.

No testimony is sufficient to establish a miracle unless the testimony be of such a kind that its falsehood would be more miraculous than the fact which it endeavors to establish.