Romans 1:21

because though they knew [there was] a God, they glorified him not as God, nor gave him thanks, but became triflers in their disputations, and their stupid heart was darkened.

Ephesians 4:17-18

This then I urge and testify in the Lord, that ye walk no more as the other Gentiles walk in the vanity of their mind,

Romans 1:19

Because that which is capable of being known relative to God, is evident among them; for God hath manifested it to them.

Revelation 14:7

saying with a loud voice, Fear God, and give him glory; for the hour of his judgment is come; and worship him that made the heaven and the earth, and the sea, and the fountains of waters.

Luke 17:15-18

Then one of them, seeing that he was cured, returned, and with a loud voice gave glory to God,

John 3:19

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

Romans 1:28

And since they thought not fit to hold the Deity in acknowledgment, God abandoned them to a reprobate mind, to practise deeds unbecoming;

Romans 11:10

let their eyes be blinded, that they may not see, and bow down their back continually."

Romans 15:9

and that the Gentiles might glorify God for his mercy; as it is written, "For this cause will I confess unto thee among the Gentiles, and sing unto thy name."

2 Timothy 3:2

For men will be self-lovers, money-lovers, boasters, vainglorious, blasphemers, disobedient to parents, unthankful, unholy,

1 Peter 1:18

knowing that ye have not been redeemed out of your vain manner of life, derived traditionally from your fathers, by the corruptible things, silver and gold,

1 Peter 2:9

But ye are an elect race, a royal priesthood, a holy nation, a people acquired by purchase; that ye should publish abroad the excellencies of him, who hath called you out of darkness into his marvellous light:

Revelation 15:4

Who should not fear thee, O Lord, and glorify thy name? because thou only art holy: for all nations shall come and worship before thee, because thy righteous judgments are made evident.

Acts 26:18

to open their eyes, to convert them from darkness to light, and from the dominion of Satan unto God, that they may receive remission of sins, and an inheritance with those who are sanctified by faith which is 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

Romans 1:19
Because that which is capable of being known relative to God, is evident among them; for God hath manifested it to them.
John 3:19
Now this is the condemnation, that the light is come into the world, and men loved the darkness rather than the light, because their deeds were evil.

They glorified

Romans 15:9
and that the Gentiles might glorify God for his mercy; as it is written, "For this cause will I confess unto thee among the Gentiles, and sing unto thy name."
Luke 17:15
Then one of them, seeing that he was cured, returned, and with a loud voice gave glory to God,
2 Timothy 3:2
For men will be self-lovers, money-lovers, boasters, vainglorious, blasphemers, disobedient to parents, unthankful, unholy,
Revelation 14:7
saying with a loud voice, Fear God, and give him glory; for the hour of his judgment is come; and worship him that made the heaven and the earth, and the sea, and the fountains of waters.
Revelation 15:4
Who should not fear thee, O Lord, and glorify thy name? because thou only art holy: for all nations shall come and worship before thee, because thy righteous judgments are made evident.

But became

Ephesians 4:17
This then I urge and testify in the Lord, that ye walk no more as the other Gentiles walk in the vanity of their mind,
1 Peter 1:18
knowing that ye have not been redeemed out of your vain manner of life, derived traditionally from your fathers, by the corruptible things, silver and gold,

Their foolish

Romans 11:10
let their eyes be blinded, that they may not see, and bow down their back continually."
Acts 26:18
to open their eyes, to convert them from darkness to light, and from the dominion of Satan unto God, that they may receive remission of sins, and an inheritance with those who are sanctified by faith which is in me.
1 Peter 2:9
But ye are an elect race, a royal priesthood, a holy nation, a people acquired by purchase; that ye should publish abroad the excellencies of him, who hath called you out of darkness into his marvellous light:

General references

James 4:17
Therefore if a man knoweth how to act properly, and doth not, he is criminal.