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I don't regret the things I've done, I regret the things I didn't do.

I don't think you can ever stop learning. There's always something new to discover.

If you can't understand why someone is doing something, look at the consequences of their actions, whatever they might be, and then infer the motivations from their consequences.

"The most important thing in empirical work is to be clear about the question you are trying to answer."