If something is good just because it is pleasurable, what does it matter whether you have sort of an abstract idea of whether it is good by someone else's sense or not?

既然令人喜爱的事物就是好的，那么何必在乎,别人对它的感受如何，这般抽象的观念呢？

耶鲁公开课 - 公正课程节选

Oftentimes, inventions that seem, in the abstract, to be good ideas may be impossible because something that you have to do to make it actually come into practice is too expensive and so it's not economic to produce the invention.

通常在理论上,创新固然不错,但却很难实现,因为把创意变成现实,花费会相当的昂贵,实现这样的创意非常不合算

耶鲁公开课 - 金融市场课程节选