Beowulf demonstrates a number of Anglo-Saxon beliefs which fall within the so-called "heroic code" of warriors. One of these is the idea that one must stay with his lord to the end—as demonstrated in the "hero on the beach" scene where Beowulf dies and gives his last speech to Wiglaf. Another is the concept of the heroic boast: it was considered customary for warriors to detail their feats to each other, illustrated in the scene in the hall when Beowulf describes his previous encounter with a sea-monster. This was not seen as being arrogant, as it might be today, but instead was an indication of a warrior's bravery.
We can also see the strong belief that life was only worth living as part of a tribe or clan, which must therefore be defended to the death. Grendel, the monster, has been exiled from any clan: therefore, he envies those who are part of the group and attacks them one by one while they sleep. This idea is reflected in Anglo-Saxon elegies such as "The Wanderer" and "The Seafarer" where the pain suffered by the speaker comes from having been cut away from a group. It is interesting to compare these speakers to Grendel.
The Anglo-Saxons also believed in the transitory nature of existence and of physical things; they were very focused on the idea of things being "laene," or transitory. At the end of the poem, when Beowulf is killed, he is buried with his treasure, which is now "as useless to men as it ever was." This underscores the idea that material things are ultimately not of great import, even though kinship bonds were often symbolized through the exchange of rings and other jewelry.
The role of women in Anglo-Saxon society is also symbolized through the behavior of good queens like Wealtheow, a peaceweaver, and equally by bad queens like Modthryth, who does not perform this duty of creating unity between tribes.