After all, the mind can be a very powerful thing. You have to remember that your mind is very much in control of your emotions and your thoughts. It is true that you cannot control what you think about, but you can control what you decide to do, and what you decide to think about. If you decide to go ahead and do something and it is a bad decision, you can change your mind and make it better.
One thing I have always tried to remind people about is that if you don’t think about an idea, you won’t have the slightest idea how to execute it. This is particularly true for planning a big event or a big promotion. If you start thinking about it, you’ll never do it. Or if you start to act on it, it won’t happen. I know this from personal experience.