He was known for being filially pious to his mother. Zhang Alao himself was tall, brave, strong, and filially pious. At one point, he was thus accused by other officials of being not filially pious. As Xu Zhigao was said to be diligent and filially pious, Xu Wen loved him. Li Heng, however, avoided consequences, as Emperor Xuanzong believed him to be filially pious. Further, the Prince of Nan'an is filially pious toward his mother. He was considered filially pious, respectful, and intelligent in his youth.