In the Chandogyopanishad it is stated that the five tattvas have evolved from the mind,the mind has evolved from prana and prana has evolved from pure consciousness. Thus the tattvas are present in every form of creation. In the physical body, they manifest as chitta shakti, prana shakti and atma shakti, which act on the body and mind through energy channels or nadis and the breath or swara.
Imagine the rush of energy that you experience when you are excited. Try to feel the channels through which the energy flows out during such experiences. At first this may seem incomprehensible, but these energy flows may be traced when you focus. Modern science explains this process in terms of nerve impulses, but the ancient seers perceived it as energy and consciousness flowing through interconnected channels in our body called nadis, which form an energy network.The word nadi means ‘flow’. Thus nadis are subtle flows of energy, just as electricity, radio waves and laser beams are subtle flows. Nadis relate to the energy in our body and should not be confused with nerves, which relate to the physical body. Nadis are pathways of pranic, mental and spiritual currents, which form a matrix throughout the physical body. They provide energy to every cell, and every organ through their vast network, carrying prana back and forth in every direction.