The Spirit of Evil
Besides the hideous giant Utgard-Loki, the personification of mischief and evil, whom Thor and his companions visited in Jötun-heim, the ancient Northern nations had another type of sin, whom they called Loki also, and whom we have already seen under many different aspects.
In the beginning, Loki was merely the personification of the hearth fire and of the spirit of life. At first a god, he gradually becomes “god and devil combined,” and ends in being held in general detestation as an exact counterpart of the mediæval Lucifer, the prince of lies, “the originator of deceit, and the back-biter” of the Æsir.
By some authorities Loki was said to be the brother of Odin, but others assert that the two were not related, but had merely gone through the form of swearing blood brotherhood common in the North.
“Odin! dost thou remember
When we in early days
Blended our blood together?
When to taste beer
Thou did’st constantly refuse
Unless to both ’twas offered?”
Sæmund’s Edda (Thorpe’s tr.).