Henry Ford famously said: “If you think you can do a thing or think you can't do a thing, you're right”. Time and time again we see how peoples’ beliefs affect their behaviour. We often influence the outcome of an event because of our attitude going into it. And it doesn’t stop at our personal lives. The beliefs we take into our workplace are just as self-fulfilling, whether it’s negotiating a deal, making a cold call or trying to win a pitch.