“In this body, the mount Meru [the vertebral column] is surrounded by sev en islands; t here are riv ers, seas, mountains, fields; and lords of the fields too. There are in it seers and sages; all the stars and planets as well. There are sacred pilgrimages, shrines; and presiding deities of the shrines. The sun and moon, agents of creation and destruction, also move in it. Ether, air, fire, water and earth are also there. All the beings that exist in the three worlds are also to be found in the body; surrounding the Meru they are engaged in their respective functions. He who knows all this is a yogi; there is no doubt about it.”