《北史·列传·卷四十一》
当时，文宣帝认为怀州刺史平鉴等人修筑的城池深入敌人境内，想放弃掉，潘乐认为轵关地处要塞，必须牢固防守，便进一步修理，增加兵将，而后才回来。
时帝以怀州刺史平鉴等所筑城深入敌境，欲弃之。乐以轵关要害，必须防固，乃更修理，增置兵将而还。
At that time, Emperor Wenzhou thought that Huai Prefecture Governor Pingjian and others had built the city deep into the enemy's territory and wanted to give it up. Pan Le believed that Zizhuguan was in a fortress and must be firmly defended, so he made further repairs, added more soldiers and generals, and came back later.