Similarly, all the sensations and motions of the body are being sent into the brain, and sent out of it, through these wires of nerve fibres. The columns of sensory and motor fibres in the spinal cord are the Ida and Pingala of the Yogis. They are the main channels through which the afferent and efferent currents travel. But why should not the mind send news without any wire, or react without any wire? We see this is done in nature. The Yogi says, if you can do that, you have got rid of the bondage of matter. How to do it? If you can make the current pass through the Sushumna, the canal in the middle of the spinal column, you have solved the problem. The mind has made this network of the nervous system, and has to break it, so that no wires will be required to work through. Then alone will all knowledge come to us — no more bondage of body; that is why it is so important that we should get control of that Sushumna. If we can send the mental current through the hollow canal without any nerve fibres to act as wires, the Yogi says, the problem is solved, and he also says it can be done.