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唯一比無知更危險的是傲慢。

Randomized evaluations can help us understand what works and what doesn't in development.

I don’t wait for opportunities, I create them.

No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.

社會聯系是幸福感最強的預測因素之一。