What you think about is what will manifest. The Law of Attraction is based on the sum of our thoughts. The things you think the most about are the things that will become physical reality around you. Your actions follow the vibrations of your thoughts, as little by little your thoughts transmute to become the energy of feeling, and that feeling is the powerful magnet-like attracting force behind everything that comes to fruition in our lives.
Mindfulness seeks to put us in a state of being able to OBSERVE thoughts without judgement. It helps us to just see the thoughts, instead of getting caught up in them.
The subconscious doesn’t know the difference between what’s real and what’s not. This also means it’s directly linked to our imaginative abilities.