《资治通鉴·唐纪·唐纪三十》
张九龄与严挺之关系亲密，想要推荐严挺之为宰相，曾经对他说： 李尚书正受到皇上的器重，你应该去登门拜访，与他搞好关系。 
九龄与挺之善，欲引以为相，尝谓之曰： 李尚书方承恩，足下宜一造门，与之款昵。 
Zhang Jiuling and Yan Tingzhi had a close relationship and wanted to recommend Yan Tingzhi to be prime minister. Therefore, he once said to Yan: "Minister Li is highly trusted by the emperor, so you should visit him and befriend him.