《宋史·列传·卷一百七十七》
我世祖皇帝以天地那么大的度量气魄，既赞扬他的节义，又爱惜他的才能，挽留他数年，好像老虎、犀牛关在笼子里，千方百计驯服它，然而始终不能达到目的。
我世祖皇帝以天地有容之量，既壮其节，又惜其才，留之数年，如虎兕在柙，百计驯之，终不可得。
My ancestor, the emperor, possessed a magnanimity as boundless as heaven and earth, and not only praised his integrity, but also cherished his talent, keeping him for years, like a tiger or rhinoceros kept in a cage, trying everything to tame it, yet never achieving his goal.