In the year 2000, Swedish leadership magazine Chef interviewed oil and mineral tycoon Adolf Lundin (1932-2006) and he provided his five keys to entrepreneurial success:

1.  Never give up!

2.  Always follow rule number 1.

3.  "No pain, no gain" - which was written on a stone on his desk.

4.  Forget hobbies and your own comfort.

5.  Find good colleagues and let them share in the profits.