First off let’s distinguish what we mean by intelligence, so we can get on the same page, and hopefully mean the same thing by the same words.
Intelligence will be, according to this article, the degree with which your perception coincides with what’s there.
The average intelligence of currently living humans is 12%. That means, roughly every eighth thing that you consider true is actually true. Of course the distribution of errors of judgment is probably different… as you will see in this article… later on.
Intelligence is also intimately related to how harmonious, how coherent you are in the moment.