《宋史·列传·卷一百三十三》
以言论为避讳，而想堵塞灾异的根源，臣知道必然不能做到。 
以言为讳，而欲塞灾异之源，臣知其必不能也。 
Based on what has been said, I believe that it is impossible to conceal the cause of disasters and abnormal meteors by avoiding certain words.