Fiction operates through the senses, and I think one reason that people find it so difficult to write stories is that they forget how much time and patience is required to convince through the senses. No reader who doesn't actually experience, who isn't made to feel, the story is going to believe anything the fiction writer merely tells him. The first and most obvious characteristic of fiction is that it deals with reality through what can be seen, heard, smelt, tasted, and touched.

Now this is something that can't be learned only in the head; it has to be learned in the habits. It has to become a way that you habitually look at things. The fiction writer has to realize that he can't create compassion with compassion, or emotion with emotion, or thought with thought. He has to provide all these things with a body; he has to create a world with weights and extension.

Flannery O'Connor, "Writing Short Stories"