Motivation is nothing with the discipline to put that motivation into action. One can dream and be motivated to do something for as long as one wants, but nothing gets done just by dreaming.
Discipline is what one needs in order to move on to the next level. The final level, in my opinion.
If you are motivated to reach a goal, then you already believe in yourself. The final step is to achieve it.
Think it. Believe it. Achieve it.