Best advice 'ever' for entrepreneurs

I often get asked the following question: “If you had to give one piece of advice for entrepreneurs what would it be?”

Here’s my answer:

Revenue must exceed expenditure.

The more it exceeds it by, the better.

I like doing cool stuff as much as the next guy, and no I wouldn’t sell tobacco to kids in Africa to make money. But it becomes really hard to do cool stuff if your business doesn’t survive.