There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bore children to them, the same became mighty men which were of old, men of renown.
All Commentaries on Genesis 6:4 Go To Genesis 6
Ambrose of Milan
AD 397
“The giants (Nephilim) were on the earth in those days.” The author of the divine Scripture does not mean that those giants must be considered, according to the tradition of poets, as sons of the earth but asserts that those whom he defines with such a name because of the extraordinary size of their body were generated by angels and women. And let us see whether by any chance the men who only take care of their body and not of their soul are similar to the Nephilim and at the same time to those giants who were born from the earth according to the tales of the poets and despised the authority of the gods by confiding in the hugeness of their body. Must we really consider as different from giants those men who, even though they are composed of body and soul, despise the most precious good of the soul, that is, the activity of the mind, and show themselves to be imitators of this flesh, as if confirming that they were heirs of their own mother’s foolishness. They only struggle in vain when they believe that they will conquer the heaven with their bold desires and their earthly activities. On the contrary, by choosing a lower way of life and despising the higher life, they are condemned with greater severity since they are guilty of voluntary sins.
