Some are so comfortable in their blindness they are not interested in seeing so they do not believe. They are sure of the darkness around them, unmoving from their spot in the middle, completely unaware of the whole universe around them that is open to wonders, experience, and adventure for the mere taking.
All they have to do is move.
But because they don’t want to believe, they do not see.
And it is to their own shame that the universe will continue to pass them by.