Thank you. I wish parents taught their kids to 'know when to quit' more often. I've read stories from founders who missed the birth of their children, left their dying parents, sacrificed everything important for some dumb startup that sells shoelaces or soap or diapers. It's one thing to be persistent and another to be delusional. And the best way to find out which one you are, is when you take a step back, clear your mind for a week or two and have a good look at yourself when you're not stimulated on coffee and twitter.