https://www.wsj.com/articles/why-you-should-sit-ou...
First, if stocks always went up, they would be riskless—and their returns would end up being paltry. The short-term pain of loss is the price we pay for the potential for meaningful long-term gain.
Second, if you have plenty of cash and courage to withstand further declines, other people’s fear could be your cue to act. As I wrote in 2009: “It is sometimes said that to be an intelligent investor, you must be unemotional. That isn’t true; instead, you should be inversely emotional.”
That means market declines don’t have to be a cause of consternation. They can be an opportunity.