It is not from the benevolence of the butcher， the brewer， or the baker that we expect our dinner， but from their regard to their own interest.

Every mathematical problem has a solution; it just takes time and creativity to find it.

In the stone business, details make perfection, and perfection is not a detail.

【译文】是是非非每天都有，若不去听它自然就不存在了。宁可生活贫困，做一个正直的人，也不能生活富足，做一个奸邪的人。有些事宁可相信它有，也不要相信它没有。