《宋史·列传·卷一百三十四》
臣以为应专命一官员，如古代所谓的行人那样，或让左右司统领，应当派遣使者时，按照成法授予他，才能免除临时斟酌的烦劳，而朝廷得以专心治理军队了。
臣谓宜专命一官，如古所谓行人者，或止左右司领之，当遣使人，举成法而授之，庶免临时斟酌之劳，而朝廷得以专意治兵矣。
My humble opinion is that we should specially appoint an official, like the so-called “messengers” in ancient times, or let the attendant ministries take the lead; and when ambassadors needed to be sent, give them instructions in accordance with the established laws so that we can do away with the trouble of making temporary decisions and the government can focus on managing the army.