Romans 1:21
Because, although they learned to know God, yet they did not offer him as God either praise or thanksgiving. Their speculations about him proved futile, and their undiscerning minds were darkened.
Romans 1:28-30
Then, as they would not keep God before their minds, God abandoned them to depraved thoughts, so that they did all kinds of shameful things.
2 Corinthians 6:15
What harmony can there be between Christ and Belial? or what can those who accept the Faith have in common with those who reject it?
John 8:55
And yet you have not learned to know him; but I know him; and, if I were to say that I do not know him, I should be a liar like you; but I do know him, and I lay his Message to heart.
John 16:3
They will do this, because they have not learned to know the Father, or even me.
John 17:3
And the Immortal Life is this--to know thee the one true God, and Jesus Christ whom thou has sent as thy Messenger.