Does shared action prove shared being?

1. Cooperation alone is indeed insufficient

“A and B build the same house” does not entail “A and B are the same being.” A Trinitarian argument merely establishing shared goals would be inadequate. The biblical justification, however, contains an additional decisive determination: Certain works characterize the one Creator over against everything created.

The subject is therefore more than the outcome of cooperation. It concerns power's origin, activity's scope and the boundary between God and creature.

Nor does the necessary inseparability of two things alone yield their identity. “Neither can exist without the other” does not logically entail “Both are the same.” Neither necessary cooperation nor necessary togetherness therefore proves the one deity by itself. Trinitarian reasoning connects the biblically attested one Creator with the Son's and Spirit's comprehensive participation in his own action; it must not replace this scriptural evidence with the weaker inference from mere inseparability.

2. In the text, creation is no process involving divided labor

Isaiah 44,24 describes the LORD as the one who creates everything and alone spreads out heaven and earth. John 1,3 says of the Logos that everything came into being through him and nothing that came into being arose without him. The Logos is not placed as the first partial product in the series of further products.^[1]

If truly everything that came into being arose through him, his own being cannot simultaneously be a creature produced through him. The text places him on the side of creative origin. A model of mere cooperation between three creatures does not answer this statement.

3. John 5 connects action, life and honor

The Son does what the Father does. He gives life to whom he wills and is to be honored as the Father is. This connection exceeds the statement that two representatives happen to have the same plan.

Prophets can perform miracles through God's power. It does not follow that the same creative action, authority over life and honor corresponding to the Father's belong to them without restriction. The difference lies not in a miracle's being particularly impressive but in the kind of claim the text connects to it.

4. The inference rests on several statements together

There is only one uncreated divine origin; the Son does not belong to creation; Father and Son remain personally distinct. Trinitarian doctrine connects these statements rather than sacrificing personal distinction or the Son's deity.

“Undivided action” consequently describes no coalition. The persons do not each contribute an independent share to a larger work. Thomas nevertheless distinguishes shared divine action from the particular personal reference of its result.^[2] The same God can therefore act in an ordered way in salvation history without three gods having to cooperate.