'Wilayat' consists of several levels such as 'Akhyaar', 'Najeeb', and 'Nukba'. But, the 'Qutub' is considered at the highest level among them. Among Qutubs the one who is the most auspicious is called "Sultanul Auliya or Ghaus".
Satan (Iblees) disobeyed Allah and envied hazrat Aadam A.S. Due to this he couldn't get Allah's bounty and mercy.Therefore, he was called Satan. Point: One who gives up all hopes from Allah becomes Satan (Iblees).