《汉书·传·赵尹韩张两王传》
羽翮不修整，就不能飞至千里；门内的事不管理好就无法治理外面的事。
夫羽翮不修，则不可以致千里；闑内不理，无以整外。
If feathers are not trimmed, they will not allow one to fly a thousand miles; if affairs within the family are not managed well, one will not be able to govern external affairs.