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Consider this analogy. When it rains heavily, the water does not necessarily penetrate the earth. If the surface is dry and hard, the rain water floods the surface and runs off. But if it rains gradually for many days continuously, and the ground is moist, then the water seeps deep into the earth, which is good for cultivation and for life. Similarly in ourselves, we must moisten our muscles and nerves through the expansion and extension of the various asana. In this way, the stress that saturates the brain is diffused throughout the rest of the body, so the brain is rested and released from strain and the body releases its stress and strain through movement. Similarly, while doing the various types of pranayama the whole body is irrigated with energy. The nerves are soothed, the brain is calmed, the hardness and rigidity of the lungs are loosened. The nerves are made to remain healthy. There is a certain vibration, which you can make rhythmic and subtler in your asana and pranayama practice without force or stress. You are one with yourself and that is in and of itself a meditative state.
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B.K.S. Iyengar (Light on Life)