John 3:19-20
And this is the sentence of condemnation, that the Light has entered the world and yet men have preferred darkness to light. It is because their actions have been evil;
John 8:55
but you do not understand him. I know him. Were I to say, 'I do not know him,' I would be a liar like yourselves; but I do know him and I hold to his word.
John 16:3
This they will do to you, because they have not known the Father nor me.
2 Thessalonians 2:11-12
Therefore God visits them with an active delusion, till they put faith in falsehood,
1 John 2:3-4
This is how we may be sure we know him, by obeying his commands.