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淡泊平靜，憂患就不能影響，邪氣就不能侵襲，就德性完備而精神不損。

"To live is the rarest thing in the world. Most people exist, that is all."

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

世界稱之為不道德的書，是那些向世界展示其自身羞恥的書。