The mental game of business ...

The mental game of business is understanding this Paradox: the better you think you are doing, the greater should be your cause for concern: the more self-satisfied you are with your accomplishments, your past achievements, your 'right moves', the less you should be.
 Mark McCormack

Quotes from the same author

If you aren't afraid to fail, then you probably don't care enough about success.
 Mark McCormack
To me, Arnold was a pioneer in the spirit of Thomas Edison or Benjamin Franklin, while Tiger is a pioneer in the spirit of Bill Gates.
 Mark McCormack
All things being equal, people will do business with a friend; all things being unequal, people will still do business with a friend.
 Mark McCormack