According to the cosmological argument for the existence of God, because nothing can cause itself, and the string of causes cannot stretch infinitely backwards in time, there must be a first cause, namely, God.

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The cosmological argument posits that everything that begins to exist has a cause, and because an infinite regress of causes is impossible, there must be an uncaused first cause, which is identified as God.

According to the Cosmological Argument for the Existence of God