When people are talking about manifesting, we can say, "I want a car, I want a car, I want a car," but if the mind is running, "I don't deserve it, I'll never be able to afford it, I'll never be a success" - if all those things are running - then those things are what we're really manifesting. They are exactly what's running our life. And as long as we believe those thoughts, thinking positively is not strong enough to override our negative beliefs.