Romans 1:21
Now they knew who God was, but they did not honor Him as God or thank Him [for their blessings]. Instead they engaged in their useless speculations and their foolish minds were filled with [spiritual] darkness.
Romans 1:28-30
And since these people refused to acknowledge God, He has allowed [or, abandoned] them to have degraded minds and to practice those things which they should not do.
2 Corinthians 6:15
And what harmony can Christ have with Belial? [Note: "Belial" means "worthlessness" and was used for referring to the devil]. Or, what does a believer have in common with an unbeliever?
John 8:55
Now you people have not known Him [i.e., to be your Lord], but I know Him. And if I should say, 'I do not know Him,' I would be a liar like you. But I [do] know Him, and I obey His message.
John 16:3
And they will do these things because they have not known [either] the Father or me.
John 17:3
And this is never ending life; that people may know you [as] the only true God, and Jesus Christ, the One whom you have sent.