《论衡·卷二十六·实知篇》
孔子不根据河图、洛书，没有听人说，自吹律管精心思考，知道了他的身世，这就是圣人前知千年以前的事的证明。
不案图书，不闻人言，吹律精思，自知其世，圣人前知千岁之验也。
Confucius did not base on Hetu and Luoshu, did not listen to what people said, he knew his life story by blowing pipes and contemplating carefully, that is a proof for a saint who can know things that happened thousands years before.