Our brains did not appear suddenly from nowhere; they evolved in the same way that other parts of our bodies evolved. Gradually, over hundreds of thousands of years before settled civilisation, those with greater abilities supplanted others. So our mental equipment is appropriate for specific needs and is related to just five senses. It is not an abstract intelligence designed to comprehend all of existence, however much we use this equipment to understand and manipulate the world around us. It has limitations.
To appreciate the implications you only have to imagine a group that lacks one of the five senses, a group that has been blind from birth, discussing sight. They have heard people talk about colour, about clouds, about mist, about distance and about beauty. How would they discuss these concepts among themselves? Some might say it is all a myth and deny that sight exists; some might be acutely frustrated that they can't quite grasp the idea; some might develop a form of words and bully others to accept their definition and others might be more tentative and try to feel their way into an understanding.
