By eating this fish a man may have all knowledge. Finnegas gave the fish to Finn to roast but told him not to eat any of it. However, during the cooking of the salmon, Finn noticed a blister appearing on its skin and put his thumb on it to make it disappear. Needless to say, Finn's thumb got badly burned and he thrust it into his mouth and onto his wisdom tooth. The boy then gave Finnegas the fish and after looking at it for a while he said to Finn: "What is your name, boy?" "It is Deimne". Finn replied. "No, it is not", said Finnegas. "It is Finn. That is your name and the prophesy that someone named Finn will gain the knowledge from the salmon has been fulfilled." The boy then confessed to having inadvertently tasted the fish. And that is how the boy then fulfilled his destiny to become the man who would be the leader of the Fianna of Eire.