Why Two Wills? Two Intellects?
...if the human nature of Jesus, as finite, is incapable in itself of comprehending the infinite knowledge of the theologia archetypa, then any equation of the theologia unionis with archetypal theology must involve some alteration of the human nature of Jesus. For Jesus to be possessed of an infinite divine wisdom according to his humanity, there would have to be either a communication of divinity to humanity or a transference of divine attributes to Jesus’ humanity within the hypostatic union. But that union takes place without comixture or comingling, without a confusion of the natures, and thus without either a communication of divinity to humanity or a transference of the divine attributes to the human nature. Thus Jesus has two natures, two wills, two intellects—a divine and a human—and each has the knowledge that is proper to it. Christ has knowledge or wisdom, then, according to two modes, the divine and the human, the former being essential and incommunicable, the latter being habitual and communicable.
Richard A. Muller, Post-Reformation Reformed Dogmatics: The Rise and Development of Reformed Orthodoxy; Volume 1: Prolegomena to Theology, 2nd ed. (Grand Rapids, MI: Baker Academic, 2003), 250.