It is taken for granted that the historian’s proper business is with acts, which come into being in time, develop in time through their phases, and terminate in time. The agent from which they flow, being a substance, is eternal and unchanging and consequently stands outside history. In order that acts may flow from it, the agent itself must exist unchanged throughout the series of its acts: for it has to exist before this series begins and nothing that happens as the series goes on can add anything to it or take away anything from it. History cannot explain how any agent came into being or
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