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 self-interest.
我们不能借着肉贩，啤酒商或面包师的善行而获得晚餐，而是源于他们对自身利益的看重。
The study of mathematics is the indispensable basis for all intellectual and spiritual progress.
Innovation is the key to unlocking a sustainable energy future.
塑造我们的不是我们生活中的事件，而是我们对这些事件意义的信念。