The Law of Attraction states that we are attracted to that which is of the same nature as our thoughts. As an example, I recently bought a new car, a Mitsubishi Outlander. Before I got the car, I never noticed Mitsubishi's on the road. They aren't the most popular car in the US. Now that I have one, I notice them much more. My thoughts are about them, so I see them more, I attract them.
So how does this apply to project management? Our thoughts can influence how we see our project. If we only think about the negative things, that's what will dominate our project, or at least that's what dominates our observations.
Here's an example of how you can use this to on your project. Most projects involve change. A good technique in change management is identifying and using your early adopters. If you think about being an early adopter, you will attract the early adopters among your stakeholders. You can then tap into them to help move your project forward.
So think positive, it will make a difference.