They are darkened in their understanding and separated from God because of the hardening of their hearts. Now Gentile means the way of life or attitude of one who does not belong to the true God. Worldliness and godliness are opposed to each other. Worldliness is centered on self. Godliness is centered on God.
Worldliness works for gain.
Godliness works for God. Godliness seeks to do the work of God. The attitude of worldliness is darkened in its understanding, separated from the life of God. It is hardened in its heart, just as in the story of the Exodus, the heart of Pharaoh was hardened to letting God s people go, even though the truth was everywhere around him in the plagues on his people. Still he would not obey the Lord but gratified his own pride.