Darqawa

"People have disputed concerning the meaning of 'sufi', With all of them saying things which fail to persuade.

I grant this appellation to none but the courageous, sincere soul

Who has, in turn, been dealt with in sincerity (sufiya) and who is thus known as 'Sufi'."

From Kitab Lata`if Al-Minan of Sidi Shaykh Ibn `Ata Allaah radi Allaahu ta'Ala anhu