Matthew Henry's Commentary on Romans 1:19-32.

But my people would not hearken to my voice; and Israel would none of me. So I gave them up unto their own hearts' lust: and they walked in their own counsels. Ephraim is joined to idols: let him alone. Their drink is sour: they have committed whoredom continually: her rulers with shame do love, Give ye. ~ Psalm 81:11-12, Hosea 4:17-18

Let them alone: they be blind leaders of the blind. And if the blind lead the blind, both shall fall into the ditch. ~ Matthew 15:14

Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart: That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
~ Ephesians 4:18, 2 Thessalonians 2:12

"(1.) Observe what they knew: The invisible things of him, even his eternal power and Godhead. Though God be not the object of sense, yet he hath discovered and made known himself by those things that are sensible. The power and Godhead of God are invisible things, and yet are clearly seen in their products. He works in secret (Job. 23:8, Job. 23:9 ; Ps. 139:15 ; Eccl. 11:5 ), but manifests what he has wrought, and therein makes known his power and Godhead, and others of his attributes which natural light apprehends in the idea of a God. They could not come by natural light to the knowledge of the three persons in the Godhead (though some fancy they have found footsteps of this in Plato’s writings), but they did come to the knowledge of the Godhead, at least so much knowledge as was sufficient to have kept them from idolatry. This was that truth which they held in unrighteousness."

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