Fun is one of the most important - and underrated - ingredients in any successful venture. If you're not having fun, then it's probably time to call it quits and try something else.

Business opportunities are like buses, there's always another one coming.

Our generation has inherited an incredibly beautiful world from our parents and they from their parents. It is in our hands whether our children and their children inherit the same world. We must not be the generation responsible for irreversibly damaging the environment.

The balloons only have one life and the only way of finding out whether they work is to attempt to fly around the world.

You get the idea. Every business, like a painting, operates according to its own rules. There are many ways to run a successful company. What works once may never work again. What everyone tells you never to do may just work, once. There are no rules. You don't learn to walk by following rules. You learn by doing, and by falling over, and it's because you fall over that you learn to save yourself from falling over. It's the greatest thrill in the world and it runs away screaming at the first sight of bullet points.

My biggest motivation? Just to keep challenging myself

I have had fun running all of the Virgin businesses, so I never see a setback as a bad experience; it is just a learning curve.