John 3:19-20
And this is the condemnation, that Light is come into the world, and men loved darkness rather than light, because their deeds were evil.
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.
2 Thessalonians 2:11-12
For this reason God is sending on them an energy of delusion, that they should put faith in a falsehood;
1 John 2:3-4
This is how we may know that we have come to know Him, by always keeping his commandments.