Well, as far as our discussion goes 'd say that knowledge would be some awareness of the nature of the act and it's consequences. One of my favorite lines in all of the OT comes directly after the narrative of the fall. The (in)famous "Am I my brothers keeper?".
Consider a world which had never tasted death. How, then, should a person know what it would mean to bludgeon their brother? How, indeed, should he have even known where his brother had gone? It's unclear how cain could have acquired such knowledge necessary for this act to be sinful, regardless of whether it was murder.... except for the earlier narrative conceit of the fruit which conferred it, and it having somehow been passed from his father to himself.
Consider a world which had never tasted death. How, then, should a person know what it would mean to bludgeon their brother? How, indeed, should he have even known where his brother had gone? It's unclear how cain could have acquired such knowledge necessary for this act to be sinful, regardless of whether it was murder.... except for the earlier narrative conceit of the fruit which conferred it, and it having somehow been passed from his father to himself.
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