A good abstraction is one that captures the essential aspects of a concept while ignoring the irrelevant details.

Joy sparks the urge to play, interest sparks the urge to explore, contentment sparks the urge to savor and integrate, and love sparks a recurring cycle of each of these urges within safe, close relationships.

The state is not a work of art; it is a necessity.

生存的规则永远不会改变，无论你是在沙漠还是在办公室。

研究的场所不是研究的对象。你不是在研究村庄，而是在村庄中研究。