《论衡·卷二十八·书解篇》
由此说来，经书残缺而不完整，诸子百家的书没有散失不全的，而经书反而有遗失的篇目。
由此言之，经缺而不完，书无佚本，经有遗篇。
From this it can be said that the classics are incomplete and fragmentary, while none of the books of the Hundred Schools of Thought have been lost, and instead there are missing chapters from the classics.