The theme of envy is prominent in the poem. Grendel is the symbol of envy in the poem. He resents the joy and happiness of the men who gather at Heorot. Unferth is another character who is envious of Beowulf's fame and goodwill.
Revenge is another major theme in the poem. Grendel’s mother dies in her attempt to avenge her son’s death. Also, the dragon seeks revenge for the theft of its treasures.
