“I am a firm believer in ‘negative thinking’ when used correctly. We need to be AWARE of negatives so that we can steer clear of them.
A golfer needs to know where the bunkers and sand traps are — but he doesn’t think continuously about the bunker – where he doesn’t want to go. His mind glances at the bunker, but he DWELLS upon the green. 
Focus on the positive. You can program your mind to achieve success and happiness in the same way that you’d program a machine to achieve certain goals.
If you wish to move forward and create more success in your life, you do need to make a conscious effort to replace those negative thoughts and feelings with positive thoughts and feelings.
Make a habit of replacing your negative thoughts with positive thoughts.”
Psycho-Cybernetics, Dr. Maxwell Maltz