John Milton began Book 9 of Paradise Lost with another prayer to his Muse. He invocates and begs Urania, the ‘Christian’ muse to guide him to perform this task when he is going to depict the actual act of disobedience by Adam and Eve. He suggests that he is too old and much less creative than what is required to describe the fall of Humans which is more ‘Heroic’ than Virgil’s Aeneid and Homer’s Iliad. He prays the ‘Christian Patroness’ to help him complete his work and show the true heroism that lies in the Christian idea of sacrifice.

Satan was sent away from Paradise by Gabriel. After 8 days, he returns to the Garden of Eden and while avoiding the eyes of Gabriel and his guards, he studies all the animals of Eden. He learns the strength and weak points of all the creatures and ultimately, he decides to take the shape of a serpent to approach Eve and tempt her. Satan believes that the serpent is the "subtlest beast of all the Field.”
Milton doesn’t mention Urania directly as his Muse in the fourth invocation. He strictly prefers to make it more Christian. He further mentions that this story is much greater and grander than Virgil’s or Homer’s work. He mentions that now the ‘Tragic’ part of his epic is going to be revealed. Satan is further degenerated before corrupting Eve. Satan again shows regret to what had happened but he shows no wavering in his determination to destroy humankind. Satan feels the agony of internal despair as he realizes that it would have been better if he hadn’t fallen and been allowed to appreciate the creation of God that he must now ruin. Milton carefully shows that Satan and Man both have absolute power to reason and free will. He expresses that the mind can become one’s own enemy by using reason to approach an unreasonable position. Satan easily succeeds in tempting Eve which again shows that woman is the weaker sex in the Miltonian world. Milton expresses Eve has lacking the ability to reason soundly. She rather falls for false praise and superficial things. Furthermore, once she is corrupted, she cannot stand losing Adam and wants him to be corrupted too. Adam knows that it would be wrong to eat the fruit but he cannot stand the situation where Eve is banished and he is forced to live without her. So he chooses Eve above God and readily eats the fruit. As a result, their pious love turns into a perverted sexual whim.
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