轻盈不仅是物理上的，也是精神上的。

The dead are our silent collaborators in the quest for knowledge.

The only way to be free is to serve.

The trade-off between bias and variance is a fundamental concept in machine learning.

The only thing that separates successful people from the ones who aren’t is the willingness to work really hard and to be really brave.

入门统计学课本一开始讲的几个要点之一，就是相关性不是因果性。这也是最先被忘记的要点之一。