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It is Einstein’s famous equation E=MC^2, in which E is energy (rajas), M is mass (tamas), and C is the speed of light (sattva). Energy, mass, and light are endlessly bound together in the universe.
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B.K.S. Iyengar (Light on Life: The Yoga Journey to Wholeness, Inner Peace, and Ultimate Freedom (Iyengar Yoga Books))