I would like to primarily focus on the phrase "this generation" that is used in the Bible....
In the whole Bible, there is one spiritual generation of sons of the devil...Cain being first, who was tempted by Satan and received the temptation and acted upon it, therefore murdering the first prophet, Abel. Cain then was a spiritual son of the devil and the first human being called of the sons/ generation of wrath. Read the history book called the "Book of Jasher" to see what Abel prophesied to Cain about the avenging of his blood by YHWH, if Abel did slay him...
The blood of all the slain of the seed of Adam will be avenged by the avenger when the books are opened in heaven, as we see in Revelation.
Psalm 14:5 -God is in the "generation of the righteous".
In the whole Bible, there is one spiritual generation of sons of God, who hear His voice, believe Him, and act upon His Word.
God gave the promise of the adoption of the lost seed of Adam into the One Living Spirit of the New Man -God come in flesh- in Genesis 3, at the fall. He signed the promise in the naming of Abram with the Life letter, the "Hey", giving Abra"H"am the sign of the adoption of Spirit of "life" as a son of God in spirit.
God gave the sign of the adoption of the flesh into the image of the Firstborn (who was to come) to Jacob, and signed it with the name change "ISRAEL", the name of the Son of God of the second human being creation [Isaiah chapter 49: 1 -6 declares it so), and the "Firstborn of the Father", as to human being created flesh, since the Adam is dead in spirit and irrevocably defiled in flesh.
So there is one spiritual generation of evil, and one spiritual generation of the righteous, in the whole Bible. The Good News is that one who is a child of wrath, like Cain, can be ransomed/bought back, by the once for all Atonement accepted, by just believing in His name.