【大意】善于游泳的人容易被淹死，善于骑马的人容易摔下马来，正是因为他们的长处，反而自招祸难。
解读：健康是人生基石，一旦失去健康，再多财富、名誉都无福消受，警示人们莫因一时贪念，损害身体，权衡利弊时，把健康放首位。
The main task in life is simply this: to identify and separate matters so that I can say clearly to myself which are externals not under my control, and which have to do with the choices I actually control.