"Randomized experiments are the gold standard for causal inference, but they are not always feasible."

The young do not know enough to be prudent, and therefore they attempt the impossible, and achieve it, generation after generation.

I don't want to wake up one day and realize I didn't live my life to the fullest.

心灵不是一块白板，而是一个不断适应和重组自身的动态系统。