《资治通鉴·周纪·周纪四》
乐先生如果能拥有齐国，与燕国成为平等国家，结为友好的邻邦，抵御各国的来犯，这正是燕国的福气、我的心愿啊！
乐君若能有齐，与燕并为列国，结欢同好，以抗诸侯之难，燕国之福，寡人之愿也。
If Mr. Le could own Qi, making it become an equal state with Yan, forming a friendly neighbor to resist the invaders from all countries, this would be the blessing of Yan and my wish!