I have six kids, my goal in life is to teach them to make good decisions. I always tell him to embrace originality in mistakes. Make them big, creative, interesting mistakes. Learn. Move on.
I like that, and hope to encourage the same in my kids (currently too young to "get it"). If you're making the same mistakes as everyone else, you're not learning by example. If you're not making mistakes at all, though, you're not learning by experience either.
That's great, I love that. How do you show them that you practice what you preach? I don't have kids myself but I can imagine that to be the hardest part.
I've started several businesses over the years and they get to see the good and bad sides. I'm also very frank about mistakes I've made in my life and about things that went well. To me it's less about preaching and more about teaching.. :-)