Historical market crashes (1929, 1973, dot-com, 2008, 2020) have all shown a rebound with a long-term upward trend, suggesting a future recovery from downturns.
"every single time the market has bounced back and there has been a long-term upward Trend so it's worth looking back at what happened and taking that into account the next time you lose money in quotation marks because you don't actually lose money until you pull that money out"