Hrothgar's farewell speech contributes to the development of the text because it shows the difference between a good hero and a good king.
Hrothgar is a good king and tries to defend his people as best he can. However, he recognizes that he is not a good hero.
In his farewell speech, Hrothgar recognizes how Beowulf is a good hero and shows how he values Beowulf's friendship, but he shows how Beowulf fails to be a good ruler and that this will prejudge his establishment as a king and harm Beowulf's own life.
In this regard, Hrothgar states that:
With this speech, Hrothgar establishes the difference between a good king and a good hero, which is one of the most important themes in the entire epic.
Importantly, "Beowulf" is the epic that tells the story of how Beowulf defeated the monster Grendel.
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