《明史·列传·卷一百三十九》
微臣听说历法使用时间长了就会出现误差，应该根据实际情况随时加以修正。 
臣闻历久必差，宜及时修正。 
Chenchen heard that the longer the calendar is used, the greater the error will be, and it should be corrected at any time according to the actual situation.