A diamonds in the rough looks like a piece of rock. If you don’t expect it, you will treat it as a rock. Or a shard of glass
But if you are willing to go beyond the surface, you will be rich. Few people ever do that. Not with themselves, not with others, not with anything in the world.
Their shallow view of the world makes their life shallow, and they will go for every glitter, every shiny object. Because they are unwilling to go beyond the top layer, the visible layer.