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.
Great literature is simply language charged with meaning to the utmost possible degree.
I never wanted to become an actress because I'd read great literature or seen great Shakespeare. It was more just wanting to understand what the people were really like, why they said all the strange things they did.
What is wonderful about great literature is that it transforms the man who reads it towards the condition of the man who wrote.
Of course the illusion of art is to make one believe that great literature is very close to life, but exactly the opposite is true. Life is amorphous, literature is formal.
And in down times it shakes a lot of the bad SF out, a lot the stuff that was bought for literary reasons, which is neither entertaining nor great literature.