For Sufis, there is no "canonical source", lol. You vocabulary reveals fraud. First of all, Islam was only a host for Sufism in a certain period of time. It is not the case anymore. Of course, many Muslims continue to engage in various cults, calling themselves "Sufis" but that does not really mean anything. Anyone can be a Sufi, of any religion or no religion at all. The greedy, selfish attempt to usurp something living and made it into a dead cult, is precisely what Shah exposed in many of his books, including The Commanding Self, which looks like you really need to study, to recognize your arrogance.