《后汉书·列传·桓谭冯衍列传上》
冯衍幼年时有奇才，年九岁，能够诵《诗》，到二十岁时就博通群书了。
衍幼有奇才，年九岁，能诵《诗》，至二十而博通群书。
Feng Yan was gifted from an early age. At nine years old, he was able to recite the Book of Poetry, and by the age of 20, he had become learned in all the books.