For although they knew God, yet they did not glorify him as God, nor give him thanks; but became vain in their reasoning, and their senseless minds were darkened.

This then I tell you and implore you in the Master's name, to pass your lives no longer as the Gentiles do in the perverseness of their minds;

This is so because that which may be known of God is manifest among them; for God has made it manifest to them.

And he cried with a loud voice. "Fear God and give him glory, Because the hour of his judgment is come. And worship Him who made the heavens and the earth And the sea and springs of waters."

Now one of them, as he saw that he was cured, came back, glorifying God in a loud voice,

And this is the condemnation, that Light is come into the world, and men loved darkness rather than light, because their deeds were evil.

And just as they refused to continue to retain God in their knowledge, so did God cast them out to an outcast mind, to do those things which were indecent.

Let their eyes be darkened, that they may not see, And bow thou down their backs forever.

and so that the Gentiles also should praise God for his mercy, as it is written, Therefore I will offer praise to thee among the Gentiles, And sing to thy name.

For men will be selfish, mercenary, boastful, haughty, blasphemous, disobedient to parents, ungrateful, irreligious,

For you well know that not with perishable things, with silver or gold, were you redeemed from the emptiness of your manner of life, received by tradition from your ancestors;

But you are an elect race, a royal priesthood, a holy nation, a purchased people, that you may show forth the virtues of Him who has called you out of darkness into his marvelous light??10 you who once were not a people, but now are the people of God; who were once without mercy, but now you have found mercy.

Who shall not fear, O Lord, And glorify thy name? For thou only art holy. For all the nations shall come and worship before thee; For thy righteous acts have been made evident."

"'so that they may turn from darkness to light, and from the power of Satan unto God, in order to receive remission of sins and an inheritance among those who are sanctified by faith in me.'

Treasury of Scripture Knowledge

Summary

Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.

General references

Bible References

When

This is so because that which may be known of God is manifest among them; for God has made it manifest to them.
And this is the condemnation, that Light is come into the world, and men loved darkness rather than light, because their deeds were evil.

They glorified

and so that the Gentiles also should praise God for his mercy, as it is written, Therefore I will offer praise to thee among the Gentiles, And sing to thy name.
Now one of them, as he saw that he was cured, came back, glorifying God in a loud voice,
For men will be selfish, mercenary, boastful, haughty, blasphemous, disobedient to parents, ungrateful, irreligious,
And he cried with a loud voice. "Fear God and give him glory, Because the hour of his judgment is come. And worship Him who made the heavens and the earth And the sea and springs of waters."
Who shall not fear, O Lord, And glorify thy name? For thou only art holy. For all the nations shall come and worship before thee; For thy righteous acts have been made evident."

But became

This then I tell you and implore you in the Master's name, to pass your lives no longer as the Gentiles do in the perverseness of their minds;
For you well know that not with perishable things, with silver or gold, were you redeemed from the emptiness of your manner of life, received by tradition from your ancestors;

Their foolish

Let their eyes be darkened, that they may not see, And bow thou down their backs forever.
"'so that they may turn from darkness to light, and from the power of Satan unto God, in order to receive remission of sins and an inheritance among those who are sanctified by faith in me.'
But you are an elect race, a royal priesthood, a holy nation, a purchased people, that you may show forth the virtues of Him who has called you out of darkness into his marvelous light??10 you who once were not a people, but now are the people of God; who were once without mercy, but now you have found mercy.

General references

So to him who knows how to do right and does not do it, to him it is sin.
All Translations
A Conservative Version
American Bible Union New Testament
American Standard Version
Amplified
An Understandable Version
Anderson New Testament
Bible in Basic English
Common New Testament
Daniel Mace New Testament
Darby Translation
Emphatic Diaglott Bible
Godbey New Testament
Goodspeed New Testament
Holman Bible
International Standard Version
John Wesley New Testament
Julia Smith Translation
King James 2000
King James Version
Lexham Expanded Bible
Living Oracles New Testament
Modern King James verseion
Modern Spelling Tyndale-Coverdale
Moffatt New Testament
Montgomery New Testament
NET Bible
New American Standard Bible
New Heart English Bible
Noyes New Testament
Sawyer New Testament
The Emphasized Bible
Thomas Haweis New Testament
Twentieth Century New Testament
Webster
Weymouth New Testament
Williams New Testament
World English Bible
Worldwide English (NT)
Worrell New Testament
Worsley New Testament
Youngs Literal Translation