《资治通鉴·魏纪·魏纪九》
徐原性情忠厚豪放，喜好直言，吕岱有时出现失误，徐原就直言进谏争辩，又公然在众人之中议论；有人告诉了吕岱，吕岱感叹地说： 这是我所以看重徐原的原因。 
原性忠壮，好直言。岱时有得失，原辄谏争，又公论之。人或以告岱，岱叹曰： 是我所以贵德渊者也！ 
Xu Yuan had a loyal and unrestrained nature, and he liked to speak his mind directly; sometimes, when Lu Dai made mistakes, Xu Yuan would directly argue with him, and would even criticize him in public; someone told Lu Dai this, and Lu Dai sighed and said:”That is why I valued Xu Yuan.”