If somebody offers you an amazing opportunity but you are not sure you can do it, say yes-then learn how to do it later!

My definition of success? The more you are actively and practically engaged, the more successful you will feel.

LEARN FROM FAILURE. If you are an entrepreneur and your first venture wasn't a success, welcome to the club.

Giving back has to do with the way I was brought up and the fact that I've traveled widely and seen terrible situations in the world. To sleep well at night, those of us who are in a position to help must address these situations. I'd get far greater satisfaction out of, say, walking into a hospital I'd built in South Africa than I would by sitting on a beach. I'm fortunate enough to be in a position to make a difference, and I don't want to waste that. I suspect I was also lucky to have parents who drove me from a young age.

If you look after your staff, they'll look after your customers. It's that simple.

Learn to raise capital by any means necessary. That's your primary job as an entrepreneur. You must continually raise capital from family and friends, banks, suppliers, customers and investors.

I'm a lad of the '60s. I started a magazine to try and end the Vietnam war, but it was a number of years before I had the profile, the financial resources and the time to do more.