The narrative describes a time when the 'sons of God' were drawn to the beauty of human women and chose to marry them. This phrase, 'sons of God,' has been interpreted in various ways across Christian traditions. Some view them as angelic beings, while others see them as descendants of Seth, the son of Adam, who remained faithful to God, contrasting with the line of Cain. This union between the 'sons of God' and human women is often seen as a significant event that contributed to the moral decline of humanity, leading to the decision of God to cleanse the earth through the flood.
The verse underscores the theme of divine-human interaction and the consequences of choices made outside of God's intended order. It serves as a reminder of the importance of maintaining spiritual integrity and the potential consequences of straying from divine guidance. The passage also reflects on the beauty and allure of human relationships, which can lead to both positive and negative outcomes depending on the context and intentions behind them.