The most important skill for an empirical researcher is not math, but judgment.

The role of the artist is to ask the right questions, not to provide solutions.

The best way to cheer yourself up is to try to cheer somebody else up.

The stream of thought is a stream of life-preserving adjustments.

解释：节俭就会产生对生产不利的因素，侈靡则造成对财富的耗费。