For although they knew God, they neither glorified Him as God nor gave thanks to Him, but they became futile in their thinking and darkened in their foolish hearts.
21. For when they knew God, etc. He plainly testifies here, that God has presented to the minds of all the means of knowing him, having so manifested himself by his works, that they must necessarily see what of themselves they seek not to know — that there is some God; for the world does not by chance exist, nor could it have proceeded from itself.
In this last part of the chapter the apostle applies what he had said particularly to the Gentile world, in which we may observe, I. The means and helps they had to come to the knowledge of God. Though they had not such a knowledge of his law as Jacob and Israel had (Psa 147:20), yet among them he left not himself without witness (Act...
Commenting on Romans 1:19-32
Because that when they knew God,.... Though they had such a knowledge of the being and perfections of God, yet they glorified him not as God. They neither thought nor spoke honourably of him; nor did they ascribe those perfections to him, which belonged to him; they did not adhere to him as the one and only God, nor honour him as the Creator of...