If we can just get young people to do the same as their fathers did, that is, wear condoms

Making the extra effort to say thanks in a genuine, personal manner goes a long way. It is pleasurable to do, and it encourages more of the same good behavior.

One of the best bits of advice I can give is, early on, when you're building a new business, try to find somebody to run it on a day-to-day basis to free yourself up to look at the bigger picture.

If you want to stand out from the crowd, give people a reason not to forget you

The truth is this: the Earth cannot provide enough food and fresh water for 10 billion people, never mind homes, never mind roads, hospitals and schools.

It isn't effective or productive to force your employees to do anything. Choice empowers people and makes for a more content workforce.

For a successful entrepreneur it can mean extreme wealth. But with extreme wealth comes extreme responsibility. And the responsibility for me is to invest in creating new businesses, create jobs, employ people, and to put money aside to tackle issues where we can make a difference.