Purity
The purity of the spirit is the real poverty. The word 'sufi' comes from an Arabic word 'safa'. Safa means purity. Sufi means one who is pure in the heart.
And what is purity? Don't misunderstand me, purity has nothing to do with morality. Don't interpret it in a moralistic way. Purity has nothing to do with puritans. Purity simply means an uncontaminated state of mind, where only your consciousness is and nothing else. Nothing else really enters into your consciousness, but if you hanker to possess, that hankering contaminates you. Gold cannot enter into your consciousness. There is no way. How can you take gold into your being? There is no way. Money cannot enter into you r consciousness. But if you want to possess, that possessiveness can enter into your consciousness. Then you become impure. If you don't want to possess anything, you become fearless. Then even death is a beautiful experience to pass through.
-Osho, “The Art of Dying, #2, Q1“