Dervishes and Sufis Distinguished

"...not all dervishes are Sufis. Moreover, the term 'dervish' indicates more the dimension of practice, while 'Sufi' designates more that of theory: the dervish is a Sufi in action, and the Sufi is a dervish in the abstract."

--Julian Baldick, Mystical Islam, NYU Press (1989, 2012), 19.