The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of a doubt, what is laid before him.
– Leo Tolstoy, Novelist
To survive effectively in the world, humans need a reasonably accurate view of the world. So the model of the real and actual world shouldn’t be too far apart in your mind, both in truth and in accuracy.