The East, that is, Islam, or at least Sufi mysticism. Attending a whirling dervish ceremony in Turkey, Charles waxed enthusiastic:

When they had finished the Prince gave a speech on Rumi’s appeal in the 21st century. “Whatever it is, it seems to me that Western life has become deconstructed and partial.” The East, on the other hand, had given us “parables of the soul”.

From "Whirling dervishes’ star turn caps Prince’s homage to Islamic mystic," by Alan Hamilton in the [1] Times (thanks to all who sent this in).