“There’s nothing that cleanses your soul like getting the hell kicked out of you.” - Woody Hayes
A stint of unemployment and poverty has a way of knocking the arrogance out of you and making you grateful for what you have.
I flunked my first tac eval as a Chaparral Platoon Leader in Germany nearly 50 years ago. I caught a lot of grief for a couple of months after that. However, it was a great learning experience. I learned the true meaning of a leader, where you're responsible for everything your unit does, or fails to do.
Never had a problem after that, I looked forward to future evaluations. It's easy to live your life when you take personal responsibility for your actions. Haven't always been perfect in that regard, but I've had a good career.