"in flaming fire taking vengeance on those who do not know God..." (2 Thessalonians 1:8)
To know God is not an intellectual exercise. He wants us to know some things about Him to be sure. But to know God is to "experience" Him. What we learn about God will lead us to experience God in our daily lives.
Do you know about God? Or, do you experience God? The difference between these two knowings will make an eternal difference.
Jason Cicero