当我们自由行动时，为了行动本身而不是为了其他动机，我们学会变得比我们原来更多。

人们不是因为变老而停止追求梦想，而是因为停止追求梦想而变老。

For systems, the analogue of a face-lift is to add to the control graph an edge that creates a cycle, not just an additional node.

我不害怕死亡，我害怕不去尝试。

The truth of history is often found in its silences.