Integrity
In this business your integrity is one of the only things that can not be influenced by cuisine, skill level, job title, or how you are perceived by your peers. I had the pleasure to work with a chef who had it. Either you have it or you do not, and Jason Rice you got it.
Once you give it away, you will never get it back. For the true grind kings, your journey through this business will be long and hard but never relinquish your integrity.