I think it's important we continue to find new ways for start-up businesses to get access to funding, mentorship and business advice.

All you have in life is your reputation: you may be very rich, but if you lose your good name, then you'll never be happy. The thought will always lurk at the back of your mind that people don't trust you.

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".

I have always believed that there is no point in having regrets as you learn far more from mistakes than successes. Embrace a mistake and learn from it; don't regret them.

There is no point in going into a business unless you can make a radical difference in other people’s lives.

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.

What matters is working with a few close friends, people you respect, knowing that if times did turn bad these people would hold together.