Adam's Apple

Red fruit or blue fruit? Take the red and your eyes will be opened and you will know good from evil...
*CHOMP*
Erm...why didn't hear me about the blue fruit of eternal life?
Discernment is far more important than living forever.

People tend to value knowledge extremely highly. Knowledge does more than shape a person's identity. In reality, it creates that identity. If one is apparently the exact same person with the exact same knowledge and personality, yet is known not to be the person in question, will others regard this person as the one that they think the person is, given that they have the knowledge of this difference? What if an identical clone were created, and others were possessed of the knowledge that the person they once knew was no more, and only the new one exists now? If one knew that the person was no longer the one they once knew, it would probably be terrible to try to get them to think otherwise.