After Emperor Xianzong died in 820 and was succeeded by his son Emperor Muzong, Niu Sengru was promoted to Kubu Langzhong (庫部郎中), a supervisorial official at the ministry of defense (戶部, Bingbu), and was put in charge of drafting imperial edicts.
Those without talents would only worry about feeding and clothing themselves and their wives and children, and there needs not to be any worries about them.