The body consists of numerous levels of subtlety and all Tantric traditions agree that a subtle body is composed of subtle channels (nadis) and winds (prana), which circulate in the subtle channels. Furthermore they agree on the existence of three principal subtle channels, two ancillary ones which crisscross around a central channel. The subtle winds course through the two ancillary channels but in most people the subtle wind cannot enter the central channel because the two ancillary ones form knots at the points where they crisscross it. As long as the subtle winds cannot enter the central one, one experiences the duality of ordinary reality.
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