I get asked this a lot and I have a pretty standard answer which is, a lot of people come to me and say "I want to be an entrepreneur". And I go "Oh that's great, what's your idea?". And they say "I don't have one yet". And I say "I think you should go get a job as a busboy or something until you find something you're really passionate about because it's a lot of work".  I'm convinced that about half of what separates the successful entrepreneurs from the non-successful ones is pure perserverance.   It is so hard. You put so much of your life into this thing. There are such rough moments in time that I think most people give up. I don't blame them. Its really tough and it consumes your life. If you've got a family and you're in the early days of a company, I can't imagine how one could do it. I'm sure its been done but its rough. Its pretty much an eighteen hour day job, seven days a week for awhile. Unless you have a lot of passion about this, you're not going to survive. You're going to give it up. So you've got to have an idea, or a problem or a wrong that you want to right that you're passionate about otherwise you're not going to have the perseverance to stick it through. I think that's half the battle right there.