We can only destroy or kill physical things. “Spiritual” things cannot be destroyed.
Nor could greys breed, anymore than we can in spiritual planes.
Let me emphasize this.
It is only on this physical planet, where life exists in a physical form, can the concept of breeding, killing, dying or in any way being physically altered occur.
In all the other dimensions, whether they be etheric or true astral, the life forms that exist on them are eternal “spiritual” forms that cannot die. Nor can they multiply through breeding or mating. Their “planet”, being etheric or astral in nature cannot be destroyed.
It is not possible to destroy anything that is not physical.
I am not the greatest expert in the world about esoteric matters but I know enough to be sure that what anyone says about the greys destroying their planet and losing their ability to reproduce is quite simply not true.
They are repeating what the greys told the American authorities as an excuse for taking our and animal DNA.
We must always bear in mind, that the various creatures that we see that we call aliens are, in fact, just a variety of robots created by the true aliens as a means of interacting with us.
That is because the true aliens do not have bodies. They are made of astral matter, as are we once we remove our robot physical form.
As we are non-physical, we also live forever but do not reproduce in the astral realms. It is just not possible so to do.
So, I apologise for laboring the point but I think that it is important to realize that what is said concerning the greys is not true.
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PDF - Can Spiritual Things Be Destroyed?