Another episode recounts how Fionn gained the ability to gain wisdom whenever he applied his thumb to his tooth. He developed this ability after inadvertently tasting the salmon which would grant universal knowledge to whoever consumed it. The salmon, which dwelled in the pool of Fés, was coveted seven years by Finn's mentor, the poet Finn Éces. Finn cooked the salmon, obeying his mentor's instruction not to partake any of the salmon before serving it to him, but burnt his thumb while cooking and sucked it, thereby receiving its gift of wisdom.