Another motivating factor for Beowulf — and a central theme in the epic — is reputation. From the beginning, Beowulf is rightly concerned about how the rest of the world will see him. He introduces himself to the Scyldings by citing achievements that gained honor for him and his king. When a drunken Unferth verbally assaults Beowulf at the first banquet, at issue is the hero's reputation. Unferth's slur is the worst kind of insult for Beowulf because his reputation is his most valuable possession. Reputation is also the single quality that endures after death, his one key to immortality. That's why Beowulf later leaves the gold in the cave beneath the mere, after defeating the mother, preferring to return with Grendel's head and the magic sword's hilt rather than treasure. He has and continues to amass treasures; his intent now is in building his fame.
Unferth's slur accuses Beowulf of foolishly engaging in a seven-day swimming contest on the open sea, as a youth, and losing. If Beowulf can't win a match like that, Unferth asserts, he surely can't defeat Grendel. Beowulf defends his reputation with such grace and persuasion that he wins the confidence of King Hrothgar and the rest of the Danes. He points out that he swam with Breca for five nights, not wanting to abandon the weaker boy. Rough seas then drove them apart, and Beowulf had to kill nine sea monsters before going ashore in the morning. His reputation intact, Beowulf prepares to meet Grendel and further enhance his fame.
