The most important lesson I learned about failure is that without it, you do not truly understand success. When success comes too easily or too early in the process, we come to believe it is the natural state of things, and when failure comes at a later date in some form or another we are most often utterly unprepared.
That's the thing about resilience -- you can only build it by accepting that everything will, one day, fail. The more ready you are to pivot when it does, the sooner you'll see big changes coming, the better you'll react to them when they arrive, and the faster you'll get back to business-as-usual once they hit.
I've always been a huge fan of Dr. Seuss. His stories provide a great message on many different levels. As a parent, the morals I found within his writings enabled me to teach my kids many valuable lessons. As I got into the business world, it was me who learned invaluable lessons as I read quote after quote from Dr. Seuss.