《资治通鉴·隋纪·隋纪一》
乐安公元谐性情豪爽，有气概风度，少年时和隋文帝曾同窗学习，非常友好，隋文帝即位后，元谐多次担任显要职位。
乐安公元谐，性豪侠，有气调。少与上同学，甚相爱，及即位，累历显仕。
Yue'an was straightforward, had ambition, and was an elegant man. He was once classmates with Emperor Wen of Sui and they were very friendly. After Emperor Wen ascended the throne, Yue'an held many important positions.