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PATANJALI YOGA SUTRAS
through phases of equilibrium and phases of imbalance; the nature of their relationship to each other is such that it is subject to perpetual change. As long as the gunas maintain their equilibrium, Prakriti remains undifferentiated and the universe exists only in its potential state. As soon as the balance is disturbed, a re-creation of the universe begins. The gunas enter into an enormous variety of combinations—all of them irregular, with one or the other guna predominating over the rest. Hence we have the variety of physical and psychic phenomena which make up our apparent world. Such a world continues to multiply and vary its forms until the gunas find a temporary equilibrium once more, and a new phase of undifferentiated potentiality begins. (A scientifically minded student should compare Vedanta cosmology with the latest theories of atomic physics. He will find many points of resemblance between the two systems.)
The gunas are sometimes described as “energies," sometimes as “qualities;” but no single English word can define their whole nature and function. Collectively, they may be thought of as a triangle of forces, opposed yet complementary. In the process of evolution, sattwa is the essence of the form which has to be realized, tamas is the inherent obstacle to its realization, and rajas is the power by which that obstacle is removed and the essential form made manifest. For the sake of illustration, let us take a human rather than a cosmic example. A sculptor decides to make a figure of a horse. The idea of this horse—the form of it which he sees in his imagination is inspired by sattwa. Now he gets a lump of clay. This clay represents the power of tamas—its formlessness is an obstacle which has to be overcome. Perhaps, also, there is an element of tamas in the sculptor's own mind. He may think: “This is going to be a lot of trouble. It's too difficult. I'm tired. Why should I make the effort”? But here the force of rajas comes to his aid. Rajas, in this instance, represents the