Romans 1:21 · KJV
“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.”
— Romans 1:21
For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, {even} his eternal power and Godhead; so that they are without excuse: {so...: or, that they may be}
Professing themselves to be wise, they became fools,
Romans 1 — Context
Because that which may be known of God is manifest in them; for God hath shewed {it} unto them. {in them: or, to them}
20For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, {even} his eternal power and Godhead; so that they are without excuse: {so...: or, that they may be}
21Because 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.
22Professing themselves to be wise, they became fools,
23And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.
Cross References
Ephesians 4:17-18
This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind,
2 Kings 17:15
And they rejected his statutes, and his covenant that he made with their fathers, and his testimonies which he testified against them; and they followed vanity, and became vain, and went after the heathen that {were} round about them, {concerning} whom the LORD had charged them, that they should not do like them.
Jeremiah 2:5
Thus saith the LORD, What iniquity have your fathers found in me, that they are gone far from me, and have walked after vanity, and are become vain?
2 Timothy 3:2
For men shall be lovers of their own selves, covetous, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy,
Psalms 50:23
Whoso offereth praise glorifieth me: and to him that ordereth {his} conversation {aright} will I shew the salvation of God. {that...: Heb. that disposeth his way}
John 3:19
And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
Revelation 14:7
Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.
1 Peter 2:9
But ye {are} a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light: {peculiar: or, purchased} {praises: or, virtues}