It has become a sinological dogma to distinguish between the so-called Taoist school (Daojia), said to have produced the classical mystical texts …, and the so-called Taoist religion (Daojiao), often said to have begun in the Later Han period [i.e., the 1st–2nd centuries CE]. The successive Daozang [Daoist Canons] never made this distinction. When we look at the way the terms Daojia and Daojiao occur in the texts preserved in the Ming Canon [published in 1445], we see that they are practically synonymous and interchangeable.   —Kristofer Schipper (Schipper and Verellen 2004: 6)