Outline of Catholic Christology
The Person of Jesus Christ
Christ is both true God and true man. According to Catholic doctrine, the cause of the unity of the divine and human natures in Christ is the Divine Person of the Son of God (the second person of the Holy Trinity), and this union of the two natures is called the Hypostatic Union. It is precisely the Word of God, that is, the Divine Person, and not a divine-human person, that ensures Jesus Christ, despite having two natures, remains one being. The human nature of Christ does not possess its own human personality but was assumed by the Word and exists through the Word.
The Two Natures of Christ
Despite the unity of person in Christ, there is no single divine-human nature. The Lord Jesus has two natures: divine and human, which remain unmixed and unchanged, and His divine nature did not absorb the human nature. As a result, Christ remains fully God and fully man.
The Two Wills in Christ
Because Christ has two natures, He also has two wills: divine and human. It must be emphasized that there was never a true conflict between them; rather, Christ’s human will remained forever obedient to His divine will. The prayer of the Lord Jesus in Gethsemane is evidence and an illustration of the existence of two wills.
The Human Nature of Christ
Christ possesses a complete and unchanged human nature. This means that He has a true human body, not merely an apparent body, as, for example, angels had when they appeared in human form. The Lord Jesus also possesses a rational human soul, which is the form of His human body. It follows that the Word of God did not take the place or function of the human soul, as then Christ could not be called a true man. The Hypostatic Union encompassed the whole of Christ, meaning that both the body and soul of the Savior were united with His divinity. The rational human soul of Christ, due to its union with the divinity, possessed perfect knowledge from the very beginning, which means that the Lord Jesus, even as a man, possessed relative omniscience and had this knowledge during His time on earth.
source: Fr. M. Siemiatycki, Outline of Catholic Dogmatics
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