If you can't understand why someone is doing something， look at the consequences of their actions， whatever they might be， and then infer the motivations from their consequences.
如果你不能理解某人为什么要做某事，那么看看他们行为的后果，不管他们可能是什么，然后从他们的后果中推断出动机。
Let's go invent tomorrow instead of worrying about what happened yesterday.
Every discovery raises new questions.
写作古文的难度，比登上青天还要难。