Ziggy Stardust
Absolutely Sane
If God created H. Ghost and Son out of himself then they would logically be 'of the same substance' (as in the Nicene Creed).
But I reckon there isn't a dogma that has created so much dispute as that of the Trinity, ever since it was first formulated.
Well, there's also the view that all of creation is made out of God himself, which would propel the concept of trinity into something far more vast.
And I could imagine the explanation that a child exists out of the building blocks of the parents, the child and the parents are parts of the same origin. In Jesus' case however I feel that the mother's role gets seriously short changed.