Romans 1:21
For when they had come to know God, they did not give Him glory as God nor render Him thanks, but they became absorbed in useless discussions, and their senseless minds were darkened.
Romans 1:28-30
And just as they had refused to continue to have a full knowledge of God, so it was to utterly worthless minds that God gave them up, for them to do things which should not be done.
2 Corinthians 6:15
Where can harmony between Christ and Belial be found? Or what participation has a believer with an unbeliever?
John 8:55
You do not know Him, but I know Him perfectly; and were I to deny my knowledge of Him, I should resemble you, and be a liar. On the contrary I do know Him, and I obey His commands.
John 16:3
And they will do these things because they have failed to recognize the Father and to discover who I am.
John 17:3
And in this consists the Life of the Ages--in knowing Thee the only true God and Jesus Christ whom Thou hast sent.