The stations of spirituality we experience in Islam especially in Mystics are very significant. Mystical figures like Hazrat Owais Qarni used to talk to Prophet Mohammad pbuh via telepathy. In the beginning they were known as "Ashab-e-Suffa" there used to be a place where all pious and righteous people used to sit and discuss religion that place's name was Suffa, so it actually means the people of Suffa.
Prophet Mohammad pbuh himself declared that the First Generation of the most pious was Hazrat Abu Bakr, Hazrat Umar, Hazrat Abu Abdullah and Hazrat Salman Farsi.
The Second Generation included Owais Qarni, Hiran Bin Yahya, Abu Ali Al-Hassan basri, and next came the Third Generation of these mystics which includes Habib-e-Ajmi(disciple of Hassan), Malik ibn Dinar, Abu Hanifa, Dawood Tai, Bishr Hafi, Dhun Nun Misri, Ibrahim Adham, Abu Yazid Bistami, Sarri Saqti (uncle of Junayd Baghdadi), Abu Haffa, Ma'ruf Karkhi and Abul Qasim Junayd.
These three generations and the following generations have devoted each and every moment of their lives to God. It is said that they had extreme rules to follow God and worshiped Him their entire lives and never asked any human for food, shelter, help, clothes or whatever.
They normally wear Kharqas (tattered clothes) and spend life in extreme poverty. Tawassuf comes from a Greek word called “sophos” but western scholars like Professor Arburry and Professor Nicholson have mistakenly proclaimed that Islamic Mysticism comes from Christianity, which however is not a fact.