I have always found Acts 2:23 ones of the best of examples of the true nature God's decrees:

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This Man, delivered over by the predetermined plan and foreknowledge of God, you nailed to a cross by the hands of godless men and put Him to death...

Murder is certainly not God's moral will. He has expressly forbidden it. Yet it was His eternal decree for His own Son to be betrayed and murdered. It kinda looks like "two wills" on the surface. But His "permissive" will (He permitted the murder of His Son) also happens to be His decreitive will (the predetermined plan).

Still amazed at God's rule - in fact getting more and more amazed all the time,
Robin