In order to take advantage of the Law of Attraction to the fullest, you must be able to keep your attention on your goal.
You must be able to hold your vision unwaveringly.
Thoughts of abundance will attract money and opportunity.
Thoughts of love will bring harmony.
Thoughts of power will yield self-sufficiency.
The attention can be trained. That is what the exercises in The Master Key System by Charles F. Haanel are doing for you. If you practice and master the exercises, then you will be able to keep your mind focused like a laser.
As you hold your attention and keep it focused on what you want, then you will attract to you the things, people, and circumstances that you need for your growth.