When I was a kid, I went through the whole process of reading great literature and trying to be very widely read.
I think you can find all the elements that you can find in great literature in mundane experiences.
I'm not writing great literature. I'm writing commercial fiction for people to enjoy the stories and to like the characters.
Great literature must spring from an upheaval in the author's soul. If that upheaval is not present then it must come from the works of any other author which happens to be handy and easily adapted.
When I read great literature, great drama, speeches, or sermons, I feel that the human mind has not achieved anything greater than the ability to share feelings and thoughts through language.