《荀子·不苟》
大凡人们的祸患，往往都是片面性害了他们：看到自己喜欢的事物，就不考虑它可厌的一面；看见有利可图的事情，就不去反顾一下它可能造成的危害。
凡人之患，偏伤之也。见其可欲也，则不虑其可恶也者；见其可利也，则不虑其可害也者。
In general, people's misfortunes are often caused by their one-sidedness: When they see something they like, they do not consider its hateful side; When they see something profitable, they do not look back to consider the possible damage it may cause.