Solomon has spent a great deal of time considering the ends of things. Sure they seem right to us here and now but, what of it in the end? He concludes that while somethings are better, some are wiser, all things are temporary, that they all end as vanity. Not everyone goes as far as to consider these things, the thought being "what does it matter?". It matters to the life to come and the abundant entrance ministered unto us into Christ's eternal kingdom kjv@2Peter:1:11.
If this were to mean singled out beforehand, it could just as well mean that those specifically who first believed (early church, disciples) were singled out and not necessarily the rest of us who believed because of their testimony. Jesus for instance chose Peter at the shoreline and may have chosen him before even creation. This is not to disregard the predestination of all but to confirm at least this much.
The forth reason for the four judgments, this on Edom itself. Edom, the descendants of Jacob's brother Esau in their unrelenting wrath not only received all the Israelite captives from Damascus/Gaza/Tyrus but pursued more with vengeance.
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