岂非教虽分三，道乃归一。奈何后世黄缁之流，各自专门，
互相非是，致使三家旨要迷没邪歧，不能混而同归矣！
《悟真篇》序 张伯端
“Is it not a fact that the three doctrines (of Taoism, Buddhism and Confucianism) may be three, but the Way is ultimately one? But that hasn`t stopped the priesthood of later generations from sole devotion to their own sects and repudiation of others, causing the basic essentials of all three philosophies to be lost in false distinctions, so that they cannot be unified and end up at the same goal.”
— Introduction of Understanding Reality by Zhang Boduan
(11th c. Taoist master)