xstrata?, page-37

This might be helpful to some.

Negative people are a drag on your goals and your ambitions. They are quick to tell you what you can’t do, offer little encouragement, and hate to see you prove them wrong by succeeding.
Hold these kinds of people are arm’s length. Don’t spend time with them. Instead, invest in friendships with positive, upbeat people; the kind of people who not only don’t belittle your ambitions, but do what they can to help you make them a reality.

http://www.careerealism.com/negative-people-hold-back-career-success/