《旧唐书·本纪·卷十一》
仁爱忠孝温顺严肃，行动必依照礼教，年幼好学，尤其精通《礼》、《易》，玄宗十分疼爱他。
仁孝温恭，动必由礼。幼而好学，尤专《礼》、《易》，玄宗钟爱之。
He was benevolent, filial, gentle and serious. He always acted in accordance with etiquette. He loved studying in his childhood, and was especially proficient in "Book of Rites" and "Book of Changes", so Emperor Xuanzong favored him very much.