One of the most helpful things that I learned was that when we are clear about our goals, our brain begins to work towards those goals consciously and unconsciously.
Another helpful concept was that the more we take responsibility for our lives and what happens in them the more successful we become. When we feel more in control of our lives we are also happier.
This was an excellent book for understanding the concepts of goal setting and achieving. It also helped me to set my own goals through the practical exercises in each chapter.