Tertullian Argued Against Marcion

Tertullian argued against marcion:
Confused gods lolling between now and then
Laying the foundation for trinitarian dogma
Like the auspicious beginnings of a clean slice of paper.
Mountain fold the square along the diagonal,
Unfold and orientate as a diamond.
Conveniently, it all seems to fit too neatly, perfect,
The origami bird that can never fly.