Our soul is immortal and this body is mortal.
Literature is the deep, true knowledge which teaches us to give up the mortal and learn the concept of immortal.
Because the base of our life is Spritual and not material. If we think, we can realize that each subject teaches us beyond material.
Our life itself is a Literature !
We learn to live real life from literature. Material is not enough (not capable) to give us a true and real life.