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Beowulf's boasting is a form of honoring his king as well as maintaining his reputation as a great warrior. Beowulf's boast reassure the people of Heorot that they will be safe. The boasting is a morale booster for them.
In this regard, what are some of Beowulf's boasts?
He is successful with Grendel, Grendel's mother, and the dragon. His skills and his heart help him make good on his boasts. Beowulf boasts so readers know exactly what he is capable of, and there will be no doubt about what he can do.
Likewise, what is Beowulf's formal boast?
She thanks God for sending Beowulf to fight Grendel, and Beowulf replies with a formal boast, stating that he will either distinguish himself with a heroic deed or die in the mead-hall.
In Beowulf's world, boasting is useful. Boasting is a necessary tool for a traveling warrior who has to be able to persuade people that he is up to whatever monster challenge presents itself. It's like a warrior resume, with a little dramatic flare. Because of his excellent boasting abilities, Beowulf got the job!