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Imagine you were to pause and take an exact carbon copy of the exact physical state of the universe in the current moment. When you press play in both universes, both universes will play out the exact same way into the end of time, and you would never be able to tell the two apart. That is determinism. If the universe were not deterministic, for reasons like non-deterministic physics, souls existing, etc. you would potentially see difference between the two as they played out separately. Another way to think about determinism vs non-determinism is that if something is deterministic, then if you have perfect information about it, you can predict it’s future states exactly. On the flip side, if something is non deterministic, no matter how much information you gather about it, you will never be able to exactly predict its future states (only probabilistically). Einstein is not so subtly telling us “god doesn’t play dice”, that there are no random physical properties of the universe, and that magic (like souls) doesn’t exist, in his opinion. Free will means we have a choice in what we do next, but if we go and examine your carbon copy in the other universe you will see they did all of the same things you did. Furthermore if we were granted perfect information about the universe and had a good enough gpu, we could from the physical principles of the universe predict the future state of everything in the universe until the end of time, including all of your future choices, hence no free will. My thoughts are that people are mixing up the human concept of free will — freedom to make decisions based on how you feel and what you know - with determinism, that the first state of all matter in the universe determined all future states of the universe, and that these are inevitable. The fallacy is that free will in the sense of determinism is only important to human decision making if we have perfect information about the current state of the universe, which we don’t - so until we do, we have to keep guessing what happens next. |