a.) you can't know wether or not the reaction would be the same, since we experience only 1 past, present and future. b.) we humans are complex enough to behave in a complex way, I don't think we would react the same to each exact same situation.

Quote:

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A person will always have the same reaction to the same event

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Especially theoretically, this is just an assumption off course, every person has more than one choice to choose from.
Fact is, we can only choose one of them, but which one we choose is entirely up to ourselves, not bound to any rule.

Cheers

Cheers