"God did not make the body, because it is destructible, and therefore not of the Kingdom."
"The body is the symbol of what you think you are. It is clearly a separation device, and therefore does not exist."
"The death of an illusion means nothing."
"A body cannot stay without illusions, and the last one to be overcome is death."
"What is understood as an illusion must disappear."
When Jesus speaks about how the body cannot live or die, this doesn't necessarily mean that the body hangs around forever in some immortalized state, which is how some people interpret it.
When Jesus says that the body is recognized as an illusion, He is talking from a very high place/level where He is completely outside of the illusion and has no illusions. From that vantage point, He recognized that the body is an illusion as much as the world is, like just an image on a screen. The image can appear to "look like" living, or "look like" death, but really AS an image it cannot be either alive or dead, it is just an image. That's what this means.
Because the body is just an image in the mind, an illusion, which when recognized as an illusion MUST disappear, within this context only can it be properly understood that the body does not really have any 'life' and it also cannot really 'die'. But people take this and then pull their mind back into the context of "illusions are real, bodies exist", and interpret it to mean the body will become permanent or something. Illusions cannot be permanent.
There is also a lot of belief that the body is going to be converted for use as a teaching device, learning device, or a communication device by Holy Spirit, and that therefore the 'ultimate state' of the relationship to the body will be that you go around using it as a Teacher of God to express Heaven on Earth. But.... you're not really going to be able to do that as the ultimate state of being, because as Jesus says, when an illusion is fully recognized as nothing it must disappear. The body is an illusion, and when recognized fully, ie when you are fully awakened as Christ, the body MUST disappear because the body is in the mind and made BY the mind, having no other cause.
The disappearance of the body is the final 'exit' from the illusion of death, because once you can see that body is NOTHING but an image - an illusion, a dream, a fantasy that you made up and used to believe in, and that it is not you whatsoever, it will be recognized as just an illusion in your own mind which will disappear when that illusion disappears. Your mind will stop creating the body image, because the body image blocks awareness of the truth.
While you think the body has any validity at all or any reason to exist, you are believing in death. The body IS the idea of death and separation. It is a thought-form of separation. So while you keep it and exalt it and make it spiritually special, you are maintaining the illusion that God's son is destroyable, and therefore are keeping death, and death will seem to happen to the body in the dream.
So when Jesus says the body cannot die, he is talking way outside the context of the illusion where the body is recognized as nothing but an illusion. You can't mix the levels, otherwise you're in "level confusion."