Dualist interaction accounts for Jesus’ willful and full obedience to the counsel of the indwelling Holy Spirit of the Father during His life and teachings on Earth. The God-Man Jesus Christ was in hypostatic union with a sinless human nature with spirit and soul and a divine nature. His spirit was indwelled by the Spirit of the Father at his baptism. It identified Him as the perfect, spotless sacrifice for all the sins of mankind through history.
These are the reasons why we confess him to be true God and truly human - true God in order to conquer death by His power, and truly human that He might die for us in the weakness of His flesh. (Belgic Confession, Article 19, The Two Natures of Christ)