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I came across this quote somewhere on the Internet and find it interesting:

"If God knows the future, then he already knows exactly what will happen and exactly when. Of course, He knows, as a part of this knowledge, that a person will pray and exactly what they will say. God can't change anything in response to prayer because he already knows what will happen. He also knows in advance every prayer that will be said by any person in the future. Another reason God can't change his mind is because that would mean that He is not perfect, which he is alleged to be. Changing His mind would indicate a mistake. So why pray about anything?"