A Dervish Textbook--the 'Awarifu-l-Ma'arif--was written by the nephew of the man who founded the Suhrawardi order of dervishes, but used as a manual by Sufis of all other orders as well.
Among the subjects discussed: The Teacher; Behavior of the Disciple; The Robe; Dreams; Deep Knowledge; State; Certainty; Essence; The Self; The Soul; Epiphany and Concealment; Austerity; Trusting; Contentment; Love; Effacement and Permanency.