Perichoresis — Three Persons Sharing One Will, Not Three
If Father, Son, and Spirit are three persons, they must have three
wills. Three wills means three independent agents — and three
independent agents means three gods. The Trinity is just a tidied-up
polytheism. Or, if the persons share one will, then they're really
just one person playing three roles — which is modalism.
The objection assumes the three persons of the Trinity are like three humans in a committee — capable of disagreement, with three separate wills that need to be coordinated. That picture is not what the doctrine teaches. Use the term perichoresis — the mutual indwelling and interpenetration of the three persons. Jesus described it in : "I am in the Father and the Father is in me." That isn't modalism (Jesus addresses the Father as distinct), and it isn't tritheism (he is in the Father, not next to him). It is the doctrine that the three persons share one divine will, exercised personally by each. When the Father wills creation, the Son and Spirit will the same creative act, because there is one undivided divine will. They cannot disagree, because there is nothing for them to disagree about — they are one God.
The three persons of the Trinity are not a committee with three wills to coordinate. They share one undivided divine will, distinctly hypostasised in each — eternal mutual indwelling, not eternal cooperation.
But in Gethsemane Jesus said 'not my will but yours'. That's two wills.
That's a sharp question — and the orthodox answer is yes, Jesus had two wills, but not as two persons. The Council of Constantinople III (681) confessed that Jesus, being fully God and fully human, had a divine will and a human will united in his one person — dyothelite Christology. The divine will is what the Son shares eternally with the Father and the Spirit; the human will is what he assumed at the incarnation. In Gethsemane, his human will recoiled from the cross while his divine will, eternally united with the Father's, embraced it. Two wills in the incarnate Son, not two wills in the Trinity.
Then John 5:19 — 'the Son can do nothing of his own accord'. That's subordination.
Subordination in operation, not in will or nature. The Son does nothing of his own accord because there is no "own accord" separable from the Father's accord — they share one divine will. The very next phrase is "for whatever the Father does, that the Son does likewise" (), and in v. 23 — "that all may honour the Son just as they honour the Father." A creature would never receive that kind of honour-parity. The Son's not-acting-apart- from-the-Father is mutual indwelling speech, not derived-deity speech.
This perichoresis word is just a Greek label to hide a contradiction.
The word is Greek and academic — but the concept is straight from Jesus' lips. "I in them and you in me" (), "I am in the Father and the Father in me" (), "all that the Father has is mine" (). The Father, Son, and Spirit don't coordinate from outside each other — they dwell in each other. That's not a label hiding a contradiction; it's a Greek name for what Jesus himself described.
If they share one will, they're one person — that's modalism.
One will doesn't equal one person. The will is what the divine nature exercises; persons are who exercise it. Three persons sharing one will is different from one person taking three roles. Modalism says the same person plays Father, then Son, then Spirit — never simultaneously. The Trinity says three persons exist simultaneously and address each other (Matt 3:16-17 — the Son baptised, the Spirit descending, the Father speaking, all at once). The shared will is what makes them one God; the distinct addressing is what makes them three persons.
Don't reach for technical theology terms in the first sentence — "perichoresis", "hypostasis", "dyothelite" are intimidating at the door. Lead with John 14:10-11 in plain language ("I am in the Father and the Father is in me"), then introduce the technical word as a shorthand. Theological vocabulary serves doorstep clarity, never replaces it.
Read alongside . Listen for the prepositions: "in me", "in you", "in them". The three persons aren't side-by-side — they're inside each other. That mutual indwelling is the Trinity.