《汉书·志·郊祀志上》
但臣怕步文成的后尘，那么方士都得闭口，不敢再谈方术了！ 
然臣恐效文成，则方士皆掩口，恶敢言方哉！ 
But minister is afraid to follow Wencheng's footsteps, so the warlocks all have to keep their mouths shut and dare not talk about numismatics anymore!