《贞观政要·卷十·论慎终》
我听说 祸福不会凭空降临，除非人自己招惹是非 。 人如果不挑衅，妖怪不会平白无故地出现 。
臣闻 祸福无门，唯人所召。  人无衅焉，妖不妄作。 
I have heard that misfortune and happiness do not come of themselves, unless one brings it on himself. If one does not provoke, evil spirits will not come unbidden.