《旧唐书·列传·卷一百一十九》
郑注得了贿赂十分高兴，寻机将李训推荐给中尉王守澄，王守澄便将郑注的炼药术、李训的《易》学造诣，一并推荐给文宗。
注得赂甚悦，乘间荐于中尉王守澄，乃以注之药术，训之《易》道，合荐于文宗。
Zheng Zhu was very happy to accept the bribe and waited for an opportunity to recommend Li Xun to Wang Shoucheng. Wang Shoucheng then recommended Zheng Zhu's alchemy and Li Xun's proficiency in the "Book of Changes" to Emperor Wenzong.