Is literature aesthetic in its form? If it is, what causes this beauty, creates this appeal and results in this artistic expression? Understanding the aesthetics of literature, poetry in particular, is made possible through the understanding of grammar (morphology, syntax, phonetics and semantics). Consequently, in the literary canon of the world, aesthetics are methodical, systematic and accessible. The present paper, evaluates the aesthetic and artistic expressions in the works of Sa’adi through analyzing its prepositions and conjunctions, and tries to demonstrate how the structural analysis of a literary work, can facilitate understanding it. This research sets to demonstrate that understanding the aesthetics of Persian literature, and grasping the application of its universal themes cannot be possible without the help of linguistic tools.