It is a logical certitude. And if you don't believe that logic can explain the absence of ego, then that contradicts, meaning there is no absence of ego.
Do not try to forgive. Instead only try to realize the truth: there is no forgiveness. Then you will see it is not sin that's absolved, it is only your judgement.
I'm talking about you, the person reading this very blog entry. Thank you for everything you've ever done. Even if it wasn't perfect, it's made you the person you are today.