How does Grendel's outsider status relate to the themes of the pain of isolation, good vs evil, and the power of art to misrepresent reality?

Grendel is a novel driven by the main character's sense of isolation. Grendel cannot relate to his mother, whom he considers little more than a brute beast, nor can he make himself understood by the humans he encounters, even though he understands their speech. Grendel is a perpetual outsider, looking for a place to belong. His high-handed search for philosophical meaning is ultimately one more attempt to know who he is and where he belongs.