粮食问题不仅是经济问题，更是政治问题，关系到国家的长治久安。

The real challenge is not just to collect data, but to make sense of it.

The mind is a constantly evolving stream of experiences.

The first fruit of this imagination—and the first lesson of the social science that embodies it—is the idea that the individual can understand his own experience and gauge his own fate only by locating himself within his period, that he can know his own chances in life only by becoming aware of those of all individuals in his circumstances.

世界上充满了显而易见的事物，却没有人注意到它们。

The art of progress is to preserve order amid change and to preserve change amid order.

思想的功能是引导行动走向成功的结果。