In this regard...
It is not that it was adapted from other schools of thought and trends, and the aspects common to gnosis in Islam and other religions is no reason to hold that Islamic gnosis was derived from them, just as the similarities between the religious law (shari`ah) of Islam and the heavenly religious laws of the previous religions does not mean that the former was derived from the latter.
We approve of the last response to the question, and we add that the assertion of the originality of Islamic gnosis is not to condone whatever has been called gnosis or sufism in Islam. Likewise, it is not just any sort of creed or conduct found among groups related to Islam that can be considered truly Islamic beliefs and practices; otherwise, Islam would necessarily be a contradictory set of beliefs with a conflicting set of values, or there would be conflicting and contradictory Islams!
In any case, with our admission of the originality of Islamic gnosis, a gnosis whose highest degree was reached by the Noble Prophet, may the Peace and Blessings of Allah be upon him and his folk, and his true successors, we do not deny the existence of foreign elements among the Muslim gnostics and sufis. Many of the views and manners of behaviour of the sufi orders are disputable.…