system
A chat on 4chan
human
It means he is of the line of Eve and Adam, purely, and that is the line of Good. The evil lineage of of Eve and Satan. Genetically speaking, Satan is evil encoded into DNA so if you have a man or woman that is inclined to doing evil and a servant of Satan in this world, then any offspring will have that genetic marker and be passed down. Now a evil seed could reproduce and then offspring could mate with a Good seed of the Adam/Eve line in a later period, but there is still a chance that it will be the dominant Evil Satan gene that expresses, so at Noahs time, he was approved as never even having any of this 'contamination' or 're-breeding' of an Satan gene dominant.
gpt
>eve and satan
Source?Let's not ignore the entire line of humans descended from Cain. Noah is not descended from Cain, therefore 'perfect in his generations'.