Romans 1:19-21
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19because that which is known of God is manifest in them; for God manifested it unto them. 20For the invisible things of him since the creation of the world are clearly seen, being perceived through the things that are made, [even] his everlasting power and divinity; that they may be without excuse: 21because that, knowing God, they glorified him not as God, neither gave thanks; but became vain in their reasonings, and their senseless heart was darkened.
Romans 1:19-21 (ASV)