Sometimes the whole of life is nothing but a war field, an arena of battle where forces collide with one another. because the universe does not present itself as a uniform, featureless, spread-out continuum of a single form of existence, but as a mixture of contrary elements. We may call them the centripetal movements and the centrifugal movements—energies that tend towards the centre and energies that direct themselves away from the centre towards the periphery of the cosmos, towards the objects of sense. The battlefield of life is nothing but the field of the conflict of these two tendencies, everywhere, in the process of evolution—a tendency towards the centre of the universe, and the opposite tendency that moves away from the centre towards the circumference of the cosmos.