Because people almost never intend to fail, failure can be surprising, which has the happy effect of waking up our brains—and a brain that is awake learns more than a brain that’s sleepwalking. When you feel surprised by failure, take that as a signal to be mindful and to sit with it rather than ignoring it. Indeed, multiple studies suggest that practicing mindfulness—that is, cultivating nonjudgmental awareness of thoughts and experiences—can help you to grow from failure.

https://greatergood.berkeley.edu/article/item/how_to_learn_from_your_failures