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The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.

The greatest trick the devil ever pulled was convincing the world he didn't exist.

Causal inference is not just about statistical significance; it's about understanding the mechanisms behind the numbers.

君子不用水來當鏡子，而是拿別人來當鏡子。用水當鏡子可以看到的是容貌，用人當鏡子則可以知道吉兇對錯。