I never guess. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.

可持续发展的关键在于通过教育和创新不断改善人力资本。

"The great advantage of being a writer is that you can spy on people. You're there, listening to every word, but part of you is observing. Everything is useful to a writer, every scrap, even the longest and most boring of luncheon parties."