What is the central practice of sufism?

Worship of Allah in true spirit and "Zikr" is central practice of sufism . There are certain Variation s in practices in different sects of Sufisms which can be seen in "Qolul Jamil " Written by Shah Wali Ullah RA .
Worship of Allah in true spirit and "Zikr" is central practice of sufism . There are certain Variation s in practices in different sects of Sufisms which can be seen in "Qolul Jamil " Written by Shah Wali Ullah RA .