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Sadi is one of the few Persian poets whose fame and eternal presence in the Persian culture rests mostly on the effect of his works. This study is an effort to investigate the relationship between his didactic, rhetorical, religious and ethical poems and the principles of the Ash'ari school of rhetorical thought. To this end, we will define the discipline of rhetoric and mention its characteristic features as well as the reasons for its emergence and development, and also the probable weaknesses and failure of the Mo'tazele and Ashare. The two dominant schools of rhetoric in the Islamic civilization will be given special treatment. However, in the final section of the project, entitled "Sa'di's school of Rhetoric" the historical background and the reasons for Sa'dis tendency toward Ash'ari school will be explained.  Finally evidence for this tendency and reflections of his Ash'ari thought samples will be extracted from his poems and will be classified and explained under the common rhetorical topics such as "divine sight", "divine justice", and "determinism and free will

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Firdowsi's Shahnameh, the poetic mythological epic of Iran, is created on the base of opposite forces of the world, namely Iran and Aniran and the battles of their people, because the design of the mythological history of Iran is also basically created on the intercourse of opposites .One of the most comprehensive philosophical views on history is  Friedrich Hegel's attitude. In this view, the nature and purpose of history is the same as nature of the human, and the nature of the human is the attainment of consciousness and freedom. This freedom can only be realized gradually and dialectically; hence, in the Hegelian philosophy the war is a way to dialectical furtherance of history and the inception of the struggle between human beings, as gods and servants, has been introduced as the basis for achieving self-consciousness. The battle between human beings in Firdowsi's Shahnameh resembles the dialectical relation of "Gods and Servants" in Hegel's philosophy. In the mythological part of Shahnameh, the achievement of self-consciousness is only through the battle of the two sides of the opposition, as gods and servants in the battles between Jamshid and Zahak, Zahak and Kaveh (and then Fereydoun), the sons of Fereydoun, and the subsequent martyrdom of Iraj and his reprisal by Manuchehr. This essay, with an analytical-descriptive approach, will analyze the philosophy of the history of Firdowsi's Shahnameh, emphasizing  the relation between "gods and servants", and concludes that in this work all conflicts will achieve a resolution that can be identified as the moments of Hegelian dialectic, and in fact, the path to self-awareness and freedom, and this is the same as the possibility of reading  philosophy of mythical history of Iran in Firdowsi's Shahnameh based on Hegelian philosophy of history.