数学的研究是所有智力和精神进步不可或缺的基础。

尊重孩子正在进行的所有合理的活动并试着了解，是我们教育方法中最首要的原则。

当你不必假装成别人时，生活会轻松得多。

The best designs come from understanding the problem deeply and then finding the simplest solution.

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.