If I tell 100 people not to think of an elephant, what's the single thing they're all most likely to think about over the next five minutes, aside from sex?
An elephant, of course.
Negation and oppositeness are perfectly intelligible semantic concepts - in general, no one is confused about what "Don't think of an elephant" means - or, more generally, "Don't do [X]," where X is any intelligible behavior. And people would know how to comply, if [X] were a physical action like sitting down. But even if they wanted to, they don't know how to not think of an elephant - even though that's a behavior they exhibit most of their waking lives, and in some sense on purpose.
Even for physical actions we are not only admonished to refrain from, but have a strong personal interest in not doing, we feel an impulse to do them anyway. Standing on a narrow ledge, afraid of falling, you might feel a strong urge to jump. Why?
Because a part of your mind that is trying to take care of you is thinking, as hard as it can, "Don't jump!" And there's another part of your mind, whose job it is to fetch ideas related to the things you're interested in. This fetcher doesn't understand words like "don't," but it does understand that you're very interested in the idea of jumping off that ledge, so it helpfully suggests ways to do so.
This can be a big problem if you're trying to find ways not to do something, or for something not to happen.
It is not possible to find ways for something not to happen.
Knowing this, how should we use our brains differently than we did before? For obvious reasons, I am not just going to tell you to avoid thinking of the things you want in terms of negations. Instead, I'm going to tell you some stories of how I used techniques designed with this in mind, to win at life.