TSK · John 16:3

Then they began asking him,“Who is your father?” Jesus answered,“You do not know either me or my Father. If you knew me you would know my Father too.”

But they will do all these things to you on account of my name, because they do not know the one who sent me.

Now this is eternal life– that they know you, the only true God, and Jesus Christ, whom you sent.

None of the rulers of this age understood it. If they had known it, they would not have crucified the Lord of glory.

With flaming fire he will mete out punishment on those who do not know God and do not obey the gospel of our Lord Jesus.

even though I was formerly a blasphemer and a persecutor, and an arrogant man. But I was treated with mercy because I acted ignorantly in unbelief,

The person who does not love does not know God, because God is love.