From Clement of Rome’s (died 99 AD) Recognitions, Book 1 Chapter 29:
…in the eighth generation, righteous men, who had lived the life of angels, being allured by the beauty of women, fell into promiscuous and illicit connections with these; and thenceforth acting in all things without discretion, and disorderly, they changed the state of human affairs and the divinely prescribed order of life, so that either by persuasion or force they compelled all men to sin against God their Creator….But against these the righteous providence of God brought a flood upon the world, that the earth might be purified from their pollution, and every place might be turned into a sea by the destruction of the wicked.
Well, that righteous men “lived the life of angels” seems like an un-evidenced assertion upon which to further assert that Genesis 6’s sons of God are Angels, as this is the ancient understanding but that these in turn are merely humans being so called.
Book 8 Chapter 50:
Wherefore, in short, at the first, when all the earth had been stained with sins, God brought a flood upon the world, which you say happened under Deucalion; and at that time He saved a certain righteous man, with his sons, in an ark, and with him the race of all plants and animals. And yet even those who sprang from them, after a time, again did deeds like to those of their predecessors; for those things that had befallen them were forgotten, so that their descendants did not even believe that the flood had taken place.
Wherefore God also decreed that there should not be another flood in the present world, else there should have been one in every generation, according to the account of their sins by reason of their unbelief; but He rather granted that certain angels who delight in evil should bear sway over the several nations—and to them was given power over individual men, yet only on this condition, if any one first had made himself subject to them by sinning—until He should come who delights in good, and by Him the number of the righteous should be completed, and by the increase of the number of pious men all over the world impiety should be in some measure repressed, and it should be known to all that all that is good is done by God.
This got into the issue of what is popularly known as incursions of which there are about two main schools (of thought, that is).
This relates to how many times fallen sons of God Angels married women and produced offspring.
One of the schools claims that that they did so multiple times but all pre-flood.
Now, technically some of those of this school hold to multiple incursions and some would actually generally term it a single pre-flood incursion with subsequent generations being the interbreeding not of Angels with humans but their half Angel and half human offspring, the Nephilim, interbreeding with humans until both the Nephilim and human lines are mixed up and corrupt.
I hold to this view in general and take “and also after that” to mean when they first did it and afterwards but yet still pre-flood (within a timespan of roughly 1.5-2 millennia).
The other school claims that they did so multiple times both pre-flood and post-flood.
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