In order to have a complete nature
Full of all experiences
God needed to sin
To count it among His powers

So he made you and me
To commit our adulteries
Mature creations doing what God wished
Yet not what He ordered

Because All comes from God
God birthed Himself to forgive Himself
Which is all theological longhand
For this:

I have already forgiven myself
After the fashion of The
Being Who Needed to Know
Just like you, another piece of God, have done