《新唐书·列传·卷一百四十二》
今北狄弱，我能控制。延陀现今如此恭敬事我，只是因为他新立，倚仗我来服众。
今北狄弱，我能制之，而延陀方谨事我者，顾新立，倚我以服众。
Nowadays the northern nomadic peoples are weak, and I can control them. Yanduo is now so respectful and subservient to me only because he has recently established himself as ruler and relies on me to keep his followers under control.