What does it mean to have someone know you? And I mean really know you; to know everything about you?
A comforting thought I am sure, but also terrifying. So while it means that God knows me; my thoughts, my heart and soul, and this can give great comfort it also means I can never hide. Everything I think and do God sees. Every nasty thought about the driver in front of me, or each time I covet my neighbours ass, or in this case car, God hears and sees.
There is not place to hide, but to be completely naked and exposed before God. While some find this comforting, I would prefer to have a fig leaf or two to hide behind.