《增广贤文·下集》
有经验的医生往往被难以根治的老毛病搞得晕头转向，而腐烂变质的过期药，遇到在好的方子，也起不到好的治疗效果。
晴带雨伞，饱带饥粮。满壶全不响，半壶响叮当。
Experience doctors are often confused by old diseases that are difficult to cure, and expired rotten drugs will not have a good therapeutic effect even if they encounter a good prescription.