《隋书·帝纪·卷四》
炀帝有儿子在后宫，他都不亲自抚养，以表示自己别无儿女私情，以此来讨好皇后。
帝后庭有子，皆不育之，示无私宠，取媚于后。
Yang Guang had sons in the harem, but he did not raise them himself, in order to show that he had no personal feelings, and to please the empress in this way.