Commentaries:
This passage records the foundation of humanity's development of a more complex system of community living, including that of agriculture, art, and technology. God surely intended more complex human communal systems to arise, but since these are descendants of Cain, Scripture indicates that they were not working alongside God to produce these developments. Their planning and building are deliberately undertaken apart from God. The fruit of such development produced the evil society before the Flood.
John W. Ritenbaugh
Ecclesiastes and Christian Living (Part Fourteen): A Summary
Other Forerunner Commentary entries containing Genesis 4:18:
Genesis 6:1-4