While I agree with the article I do think there is a single most important secret: "Don't give up". (I might add its not the only thing - just like the article

While I agree with the article I do think there is a single most important secret: "Don't give up". (I might add its not the only thing - just like the article says - but without this one you are never going to make it. And I know it sounds obvious but I've met loads of people with the skills and ideas to make it but have not got the stamina to "do what it takes" to make it)