The Hebrew word for knowledge comes from the root word yada. Yada is to know well, to have a close connection, to be intimate friends. It’s a two-way connection—to know and to make oneself known.
Psalm 139:1-2 (NIV)
You have searched me, Lord, and you know me. You know when I sit and when I rise; you perceive my thoughts from afar.
God knows us better than we know Him. He even knows our thoughts — and, truth be told, that’s a bit scary. Good thing we know He loves us.