When I was a kid my parents gave me the book The Value of Believing in Yourself. The Story of Louis Pasteur.
As I reflect on some of the most important lessons and values I have learned in my life this is one or the more important ones that has led to the greatest sense of joy and fulfillment in my life. If you have not read the book I would encourage to read it and more importantly pick the top three goals in your life that are important to you and focus and believe in yourself that you can accomplish what you set-out to.