Romans 1:21
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.
Romans 1:28-30
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.
2 Corinthians 6:15
What concord has Christ with Belial? What portion has a believer with an unbeliever?
John 8:55
"You are not acquainted with him; I know him. Were I to say, 'I do not know him,' I should be like you, a liar. But I do know him, and I obey his teaching.
John 16:3
"And they will do these things because they have not known my Father, nor me.
John 17:3
And this is eternal life, to know thee, the only true God, and Jesus Christ whom thou hast sent.