"It is, of course, mine to watch over the human world, as the appointed monitor over all. Everything, I say, everything... I have seen everything of humanity. I have lost hope in these creatures whose folly only grows with each generation. What I mean to say is that I do not find you worth speaking to. You understand, I trust?"
Heimdall is one of the gods in Norse Mythology, called the "White God" in the Edda.
Heimdall is the guardian of the Bifrost Bridge, or the rainbow, and therefore the link between Midgard and Asgard. Legends foretell that he will sound the Gjallahorn, alerting the gods to the onset of Ragnarok, where the world ends and is reborn. Heimdall was destined to be the last of the gods to perish at Ragnarok when he and Loki would slay one another.
Heimdall, as guardian, is described as being able to hear grass growing and single leaves falling, able to see the end of the world, and so alert that he requires no sleep at all. Heimdall is described as a son of Odin, perhaps a foster son.
"One of the most beautiful gods of Norse lore, he is also known as the White God. He guards the Bifrost Bridge, the entrance to Asgard, and will blow his Gjallarhorn to signal the beginning of the end. He and Loki are fated to kill each other at the end of Ragnarok."