I must say, I have been trying to read the Bible for the first time end to end (Just finished the Old Testament recently) and if there is one that that stood out apart from the religious aspect, is that human behavior is not radically different today than it was after Adam and Eve were banished.
The technology is different, but the same vices, flaws, lust for power, lies, and antisocial behavior has not changed at all. While the way these things are manifested have indeed changed, the underlying flaws in us as humans have not.
As you said, nothing is new under the sun.
Yes.. 30 years ago I started reading for myself beginning in Genesis.. I could not find anything about an apple orchard.. nooo it was a fig grove where the party took place.. by the time I got to David the shepherd boy calling out Goliath as uncircumcised…. I too was Hmmmmm. there is nothing different in the mind and matter of human since the .beginning. Then years later I come across the book of Ecclesiastes and there it was there is nothing new under the sun…