话说唐朝诗人李白，诗才横溢，名震天下。一日，他应邀为一位富商作诗，富商对李白非常敬重，承诺以千金的价格购买李白创作的一首诗歌。李白欣然应允，提笔挥毫，不多时便写成一首诗，诗中字字珠玑，句句千钧。富商看完后，连连称赞，并如约支付了千金。但李白却说，这诗歌的价值远不止千金，而是千钧之重，因为它蕴含着深刻的哲理，对社会和人生都有着重要的启示。从此，“一字千钧”就成为了人们形容文章或言语分量很重的典故。
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