God spoke to His people through the prophets during the Old Testament times, but in these last days He has spoken to us by His Son.
In the fullness of time, the divine Son of God became incarnate, meaning that He took on human flesh. In doing so, He assumed human nature without losing His divine nature.
Jesus Christ is not part God, part man. He is truly God and truly man, in the unity of His divine person.
Because Jesus is both God and man, He is the one and only mediator between God and man.
The Son of God became man in order to save us by reconciling us with God, so that we might know God's love, to be our model of holiness, and to make us partakers of the divine nature.
Jesus Christ, the Son of God, is one divine person who possess two natures. He has a divine nature and a human nature, which are united in the one divine Person. This mystery of Christ is the profound union of the divine and human natures in the one Person of the Son.
No mere human being, even the holiest, would be able to take on the sins of all humanity and offer himself as a sacrifice for all.
Jesus Christ is both God and man. Fully human, Jesus can represent the human family and offer a gift of love on behalf of all humanity. Since He is also fully divine, His gift of love takes on infinite value--offering the perfect, redemptive sacrifice for all.
When we say Jesus "descended into hell" in the Creed, this does not refer to the place of damnation, but the realm of the dead... Jesus in His human soul united to His divine person went to the realm of the dead and opened Heaven's gates for the just who had gone before him.
Jesus truly rose from the dead.
By His Death, Jesus liberates us from sin. By His Resurrection, He opens for us the way to new life in Him that we may become sons and daughters of God and have eternal life.
By His Ascension into Heaven, Jesus precedes us into His Father's glorious kingdom in Heaven.
Jesus invites us to participate in the mystery of His Death and Resurrection by uniting our entire lives -our daily works, joys, and sufferings- with the Cross of Christ.