The OT is like a darkened room. It's only when you bring the light of the NT to it that you are able to see it clearly. It's a large room with many items. As your understanding of the NT grows, you begin to see the outlines of the objects in the room. This grows until you can see the items clearly.
Also, while we're illustrating things, I'd like to add you can make continuous progress understanding the OT by using a method known as "tacking". That's where you flip back and forth between violent passages of the OT and peaceful passages of the NT until you somehow justify them both as being peaceful by just ignoring the violence. So while you're going side to side, you're also moving forward in an this vast.. ocean... of baloney. Or something like that.
Geez, I'm being an ass today and can't stop.