Two prices, paid separately, for two things that are not the same. One buys knowledge that already exists and is being kept by somebody else. The other buys knowledge that has to be dragged out of the dark by a man in the process of dying. Norse tradition keeps them in different poems, and reading them together is the fastest way to understand what kind of god Odin is: not wise by nature, but wise by expenditure.
The well under the root
Beneath one of the roots of Yggdrasil — the root that runs out towards the frost-giants, over what had been the primal void — there is a spring.
Wisdom is in the water, and understanding, and the being who owns it drinks from it every morning out of a horn. That is Mímir. What he knows, he knows because of the drinking, and he has been at it for as long as there has been a there.
Odin came to the spring and asked for a drink.
He did not get one for free. The price was set and he paid it: he put out one of his own eyes and left it in the water. It is still in the water. When Völuspá's seeress wants to tell Odin that she knows exactly who she is talking to, she names the hiding place of the eye, and adds that what Mímir lifts his horn of mead from each morning is the thing Odin left behind as security. She is telling him she has seen the receipt.
The exchange is exact in a way that is easy to miss. He gives up half of his ordinary sight and receives insight. Nothing in the sources says the eye grew back or that the loss was symbolic. He is a one-eyed god from that morning on, and every later description of him — the hat pulled low, the hood, the traveller who will not look at you straight — is describing the consequence.
Nine nights on a tree
The other payment is described in the first person, in a handful of stanzas near the end of Hávamál that read unlike anything else in the corpus.
He hung on a windswept tree for nine full nights. He was wounded with a spear. He was given to Odin — himself to himself, in the poem's flat and unnerving phrase — on a tree whose roots no one knows.
Nobody handed him bread. Nobody passed him a drinking horn. He looked down, and he reached down, and he took up the runes; he took them screaming, and then he fell back off the tree.
What follows is the only part of the sequence that sounds like relief. He began to thrive. He grew, and became wise; one word led him to another word, one work to another work. In the same stretch of the poem he reports getting nine powerful songs from the son of Bölþorn, his mother's brother on the giant side, and a drink of the precious mead that had been poured from Óðrerir — which is a different acquisition again, told properly in the mead of poetry.
Then the poem turns into an instruction manual: how to cut runes, how to read them, how to stain and test them, and a numbered list of eighteen charms whose eighteenth he refuses to teach to anyone except a woman who holds him in her arms, or his sister — and there the poem stops, on the one secret withheld.
Reading the two payments together
The eye is a transaction with a third party who holds something Odin wants. He identifies the owner, learns the price and meets it. That is the sovereign's way of getting knowledge: find who has it, buy it.
The tree is not a transaction with anybody. He is both the sacrifice and the god the sacrifice is made to, both the man on the rope and the spear-point's owner. Nothing is exchanged; something is extracted. And what he brings up is not information but a technology — the runes, the means of fixing speech in wood and stone, of binding, healing, cursing and remembering.
Norse tradition keeps making this distinction. Knowledge that can be bought is bought. Knowledge that cannot be bought is suffered for.
Where each piece actually comes from
The two episodes have different evidentiary weight and should not be presented as one continuous scene.
- The eye and the well. Völuspá stanza 28 refers to it as something the audience already knows, without explaining. The narrative detail — that the spring is under a named root, that Mímir drinks from the Gjallarhorn, that the eye was a formal pledge for a single drink — is Snorri Sturluson's in Gylfaginning, and Snorri is the only source for it. What is old is the fact of the pawned eye; the mechanics are his.
- The hanging. Hávamál 138 onwards, in the Codex Regius. It is Odin speaking, it names no tree, and it does not connect itself to the well at all. The identification of the tree with Yggdrasil is an inference — a very strong one, given that Yggdrasil's name plausibly means Ygg's horse, and "horse" is standard gallows-slang in Norse poetry, so the world-tree may literally be named "Odin's gallows."
Joining them under one heading, as this page does, is an editorial choice made because the two payments illuminate each other. The sources do not join them, and anyone citing this material should say which poem each half comes from.
The Mímir problem
There are at least three Mímirs in the corpus and it is not agreed how many of them are the same person.
There is the owner of the well. There is the hostage: in Ynglinga saga, Snorri tells how the Æsir and Vanir ended their war by exchanging hostages, how the Vanir concluded they had been sold a fool in Hœnir because he could not answer anything without Mímir at his elbow, and how they took Mímir's head off and sent it back. Odin preserved the head with herbs and spoken charms so that it kept talking, and consulted it thereafter — which is why, in Völuspá, he is speaking with Mímir's head at the very edge of Ragnarök, and why Sigrdrífumál credits the severed head with the first wise word about runes. And there is Mímameiðr, a tree named in the late poem Fjölsvinnsmál, which may or may not be Yggdrasil under another name.
Snorri writes as though the well-owner and the beheaded counsellor are one being; the Eddic poems never say so. Whether the well is Mímir's because he owns it or because his head is in it has been argued both ways for well over a century, with no decisive evidence either direction.
Snorri's tidy scheme of three roots with three wells — Mímir's spring, the well of the Norns at Urðr's, and Hvergelmir where Níðhöggr lies — is also a piece of systematising. The poems mention the wells, but not in a scheme that matches his, and Grímnismál's account of the roots disagrees with his outright.
The crucifixion argument
A wounded god, hanging on a tree, pierced with a spear, given up as a sacrifice, in the dark, without food or drink, who comes back changed. The resemblance to the Passion is not something a reader has to be told.
Sophus Bugge, in the 1880s, built an entire theory on it: that Norse mythology as we have it is substantially a Viking-Age reworking of Christian material picked up in the British Isles. Almost nobody holds the strong form of that thesis now, and the reasons are good ones. Hanging as a sacrifice specifically to Odin is independently attested and is not a Christian practice: Adam of Bremen describes bodies hanging in the grove at Uppsala, Gautreks saga preserves a mock-hanging with a reed that turns into a spear and a calf-gut that turns into a rope, and Odin's own titles include god of the hanged. Iron Age bog and hanging deposits in Denmark are considerably older than any Christian contact.
The honest position sits in the middle and is worth stating on its own terms: the practice behind the stanzas is native and old; the wording of a poem written down in thirteenth-century Christian Iceland may well have been coloured by a scribe or performer who knew the other story. That is a much smaller claim than Bugge's, and it does not make Odin a copy of anybody.
Questions that come up about this material
Which eye did he lose? The sources do not say. The convention that it is the left is modern and has no textual basis; medieval Icelandic art is not detailed enough to settle it either.
Is the wisdom from the well ever described in use? Not directly, and that is a real gap. Odin is shown consulting Mímir's head at the crisis, and he wins wisdom contests against giants, but no text says "because of the drink he did X." The eye buys a general condition, not a specific power.
What are the runes he takes up — the alphabet, or magic? In Old Norse the word covers both, and the poem exploits that. The stanzas move directly from picking the runes up to knowing how to cut, read, stain and test them, and then into charms, without treating writing and spellcraft as separate skills. Trying to split them is a modern instinct.
Does the ninth night mean anything? Nine is the recurring number in Norse ritual counting — nine worlds, nine nights, sacrifices every ninth year at Uppsala according to Adam of Bremen, nine days between Skírnir's errand and its outcome. It functions the way seven does elsewhere and is not explained anywhere in the corpus.
Why does the eighteenth charm stop the poem? Because a wisdom poem has to end somewhere, and ending on a withheld secret is a strong rhetorical move. It also fits Odin exactly: he acquires knowledge relentlessly and distributes it on his own terms.
Continue with Odin himself, the world-tree, the Norns at the other well, and the third great acquisition in the mead of poetry. The tradition as a whole is mapped at the Norse hub.