Sufism can only be defined as Ihsan, and must be bound by its definition

"The Shari'a is Hudood (boundaries/framework), The Tariqah is U'hood (pledges to persist and persevere on the difficult walk), and The Haqiqah is Shuhood (witnessing). At the end they are all one of the same, just different dimensions of the Qur'an and Sunnah".