Originally Posted by ordinaryguy
All of the answers given so far are some variation on the theme, "It was a test". If that were the only purpose of it, the tree could just as well have been a persimmon or mulberry tree. But maybe there is some significance in the fact that it's the "tree of knowledge of good and evil" that was forbidden. Maybe "thou shalt surely die" wasn't a threat of punishment for disobedience, but a simple statement of cause and effect.
To know the difference between good and evil is to become subject to death. Why would that be? Because the only way to know the difference between good and evil is to succumb to the illusion that one is separate from God. If we are one with the Father, we are untouched by evil, but if we think we are separated from God, the natural result of that belief is death.
I know this interpretation won't be acceptable to those of you who are satisfied with a strictly literal interpretation of the Bible, so if that describes you, feel free to ignore this post. This response is directed toward those who are drawn to a more allegorical or mystical approach to the subject, if there are any of you out there.