《后汉书·列传·郭符许列传》
宋果被他感动悔悟，叩头承认错误。因此改邪归正，自己约束自己。
果感悔，叩头谢负，遂改节自敕。
Song Guo was moved and came to his senses, kowtowing and admitting his mistakes. As a result, he turned away from his wicked ways and disciplined himself.