Have passion for what you do; believe in yourself and your product and your customer; persevere; delegate; listen. Have fun. Today, I add: "Do good".

Space travel will be like every other business. There will be competitors. . . . Thirty months from now, I'm confident we'll be flying people into space.

Bakers bake bread, accountants manage accounts and entrepreneurs turn ideas into reality.

I never went into business just to make money - but I found that if I have fun, the money will come. I often ask myself, is my work fun and does it make me happy? I believe that the answer to that is more important than fame or fortune. If it stops being fun, I ask why? If I can't fix it, I stop doing it.

Everyone needs something to aim for. You can call it a challenge, or you can call it a goal. It is what makes us human. It was challenges that took us from being cavemen to reaching for the stars.

You can never go too far wrong by thinking like a customer who’s new to the business.

Please don’t get hung up on this question of whether you need to have experience in an industry before you launch your startup.