Sufism is the path of Islamic mystics to reach the Truth —God
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Sufism has been defined in many ways. Some see it as God's annihilating the individual's ego, will, and self-centeredness and then reviving him spiritually with the lights of His Essence so that he may live according to His will. Others view it as a continuous striving to cleanse one's self of all that is bad or evil in order to acquire virtue. Junayd al-Baghdadi, a famous Sufi master, defines Sufism as a method of recollecting "self-annihilation in God" and "permanence or subsistence with God." Shibli summarizes it as always being together with God or in His presence, so that no worldly or other-worldly aim is even entertained. Abu Muhammad Jarir describes it as resisting the temptations of the carnal self and bad qualities and acquiring laudable moral qualities.
There are some who describe Sufism as seeing behind the "outer" or surface appearance of things and events and interpreting whatever happens in the world in relation to God. This means that a person regards every act of God as a window to "see" Him, lives his life as a continuous effort to view or "see" Him with a profound, spiritual "seeing" indescribable in physical terms, and with a profound awareness of being continually overseen by Him.
All of these definitions can be summarized as follows: Sufism is the path followed by an individual who is seeking to free himself or herself from human vices and weaknesses in order to acquire angelic qualities and conduct pleasing to God.
-- M. Fethullah Gülen