And because you can't really know, it's difficult to make the right kinds of plans.

又因为你无法知道，要作正确的规划就困难重重。

耶鲁公开课 - 死亡课程节选

Right? Because of unpredictability, you can't really know.

对吧？因为有不可预见性，你无法知道这些事。

耶鲁公开课 - 死亡课程节选