I was gonna say a mirror at first, but that's not right. It might help if you can examine what you were guilty about from a bunch of different angles -- and be able to hold on to it. More perspective.

So, a prism, maybe. A heavy one, if it's to keep Guilt pinned in one place where you can deal with it . . . but also one you can look through to the other side, to the rest of what's there, when you're ready.