"...how did it happen you lost your eye, Lord?'
"Eodan smiled. It was a wry smile, not ungentle, but wholly without youth. He had known too much ever to be young again. He said, 'I gave it for wisdom.'"
-Poul Anderson, The Golden Slave (New York, 1980), XX, p. 279.
The Golden Slave is a historical novel and we have realized while reading it that Eodan is the original of Odin. Eodan, like the title character of Anderson's sf novel, Ensign Flandry, has lost his youth. Therefore, he has matured? Therefore, he has gained some measure of wisdom? Maybe.
SM Stirling's William Walker tells a barbarian chieftain:
"'I don't miss the eye. You see, I sacrificed it for wisdom.'"
-SM Stirling, Against The Tide Of Time (New York, 1999), Chapter Eighteen, p. 281)
This novel is science fiction. Far from being the original of Odin, Walker is a time traveler who knows well how to exploit the power of myths. The barbarian steps back and shudders. Here, "wisdom" would mean not only insight and understanding but also supernatural power. Walker and his fellow time travelers will prevent the history that led to the myth of Odin but Walker himself might well initiate a myth of a one-eyed demon. His companion, Hong, already claims to be an avatar and not of anything good.