In Irish tradition, all the wisdom of the world was concentrated in a place called the Well of Segais — a sacred pool somewhere in Connacht, surrounded by nine hazel trees. The hazels dropped their nuts into the water. A single salmon, *An Bradán Feasa*, the Salmon of Knowledge, ate the nuts. With each one, it grew wiser. The bargain of the myth was simple: whoever ate the salmon's flesh first would know everything that was, is, and would be.
The poet Finn Eces — sometimes called Finnegas — knew this. He spent seven years on the banks of the River Boyne trying to catch the salmon. Eventually, with the patience that only poets and fishermen really understand, he did. He was overjoyed. He had a young apprentice with him, a boy named Demne, and he gave the boy one job: cook the salmon on a spit over the fire, do not eat a single piece of it, and call me when it's ready.
Demne built the fire. He cooked the salmon. As it sizzled, a blister rose on its skin. Without thinking, he pressed it down with his thumb to flatten it — and burned himself badly. He stuck the burnt thumb in his mouth. In that instant, the entire wisdom of the salmon entered him.
When Finn Eces saw the boy come to fetch him, he knew at once from the look in Demne's eyes what had happened. There is no fury in the story; only a sort of weary grace. "You must eat the rest of it," the old poet said. "The salmon was never meant for me. It was meant for someone called Finn. And that, now, is you." From that day forward, Demne was known as Fionn mac Cumhaill — Finn, son of Cumhaill — the greatest hero in all of Irish myth.
For the rest of his life, whenever Fionn needed an answer he could not reach by ordinary thought, he had only to put his thumb into his mouth and bite down on the place the salmon had burned. The wisdom came back. The Irish call it *teinm laída* — illumination by chewing.
Wear the Salmon of Knowledge and you wear one of the gentlest pieces of Irish wisdom: that great gifts almost never arrive in the way you planned to receive them, and the right person to inherit a thing is rarely the one who hunted it for seven years.