Resilience can be summarised as the triumph of realism over perfectionism. Individual insight as to what can be achieved whilst still leaving one in a condition to achieve again. One of the more useful articles I have read recently.
If you’re trying to build resilience at work, you need adequate internal and external recovery periods.
https://hbr.org/2016/06/resilience-is-about-how-you-recharge-not-how-you-endure