To take off the cover separating man from Christ, a process is necessary. This process is the same which takes away stains and lines from paper by rubbing. The process is safa, from which comes Sufi. Safa means to clean, to wash, or to erase, and by this the soul is purified. This shows the mission of Sufism, and the work of the Sufi Order. Every process of meditation and concentration is to wash the soul of the stains of earthly experiences.