The present paper defends Augustine's claim that time is ontologically dependent on the world. My proof is accomplished by establishing two sub-proofs. First, I argue that time requires change by criticizing Shoemaker's argument for the counterclaim that time does not require change. Second, I go on to show that there is no source of change apart from the created universe. I conclude that if we grant the traditional theistic assumption that the created universe has a beginning and an end, then since time is ontologically dependent on the world, time cannot extend from the infinite past into the infinite future. And if time does not extend from the infinite past into the infinite future, then a temporal God has a beginning and endures for only a finite period of time. This implausible consequence gives us reason to believe that God is eternal.
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