I think its more about the ability to know. Like having the key to someone's hotel room, but choosing not to use it to see whats happening inside the room.
I'm not sure that's a good analogy. Putting aside that God created the hotel, all the rooms, and the content of each room, if He found Himself on the outside of this "room", how does He know its the right room to look into, or even pass by? Who or what is labeling the rooms for God?
Its more or less concluded from Paul's passages in Romans Chapter 5, where he states how sin entered the world through Adam's disobedience and death through it, and how Jesus' act of justification can mean everlasting life for all. This alludes to the point that there was a time when there was no sin, (means perfection - relative, not absolute) and hence no death.
Whatever state that was, why is it "perfect" and not just "very good"?