According to British writer James Allen, pioneer of the self-help movement: as a man thinks in his heart, so is he. I think this statement is not far from reality. Look around and ask yourself: What you have, what you do, what you are until today, is the product of your thoughts? The answer to this question is probably different for each of us.
However, in my experience, having a positive mindset or as we usually say, good thinking, has a great influence on everything we do and achieve. How are you using your thinking?