Can pure and basic logic be more simple than when treating any aspect of eschatology?

I gather that in order to be logical correct one should always build upon a stable premises.

I can only think of 'change' to be stable, and death or passing away to be sure of. With this in mind I wonder if someone says something and exit thus having the last and final word then this testimony cannot ever be challenged since what had been decreed (even if false) cannot be changed. I also have this idea that people starting thinking of an afterlife only after they had noticed people sleeping and not waking up again. Plants have seeds that die and would grow up over again - is eschatology a base of logic upon which we could apply experience that is always drifting away?