Well I think it is pretty simple. Integrity and dignity. If you don't take responsibility for your mistakes then no one will respect you. You probably will not respect yourself and then how can you lead? Who would follow you?
I find people are so afraid to be vulnerable...or be wrong. What if being wrong was just part of being human? Guess what? It is!
So once we start to accept that we are fallible and just trying to do our best then I think some really interesting things can happen...people start to be less afraid and be more creative.