Arcana Coelestia #564
564. Verse 1. And it came to pass that man began to multiply himself upon the faces of the ground, and daughters were born unto them. By “man” [homo] is here signified the race of mankind existing at that time. By the “faces of the ground” is signified all that tract where the church was. By “daughters” are here signified the things appertaining to the will of that man, consequently cupidities.
Genesis 6:4
4
The Nephilim were in the earth in those days, and also after that, when God's sons came in to men's daughters. They bore children to them. Those were the mighty men who were of old, men of renown.