According to Osho, Sufis dance because their meditation uses positive, active energy: ecstasy. In divine rapture (wajd) the inner joy overflows into the body; there is no dancer—God dances through them. The movement is spontaneous, a surrendered intoxication that dissolves the ego. Like Zen stillness, this ecstatic path also leads to the same transforming center.
They dance because God’s joy moves them by itself—dancing is their way to meditate and let that energy flow.