From the Paris Review:
“For the writer of fiction,” Flannery O’Connor once said, “everything has its testing point in the eye, and the eye is an organ that eventually involves the whole personality, and as much of the world as can be got into it.” This way of seeing she described as part of the “habit of art,” a concept borrowed from the French Catholic philosopher Jacques Maritain. She used the expression to explain the way of seeing that the artist must cultivate, one that does not separate meaning from experience.
The visual arts became one of her favorite touchstones for explaining this process. Many disciplines could help your writing, she said, but especially drawing: “Anything that helps you to see. Anything that makes you look.” Why was this emphasis on seeing and vision so important to her in explaining how fiction works? Because she came to writing from a background in the visual arts, where everything the artist communicates is apprehended, first, by the eye.