Catholics believe that Jesus Christ is the "Second Person" of the Trinity, God the Son. In an event known as the Incarnation , through the power of the Holy Spirit, God became united with human nature through the conception of Christ in the womb of the Blessed Virgin Mary . Christ, therefore, is understood as being both fully divine and fully human, including possessing a human soul . It is taught that Christ's mission on earth included giving people his teachings and providing his example for them to follow as recorded in the four Gospels.  Jesus is believed to have remained sinless while on earth, and to have allowed himself to be unjustly executed by crucifixion , as sacrifice of himself to reconcile humanity to God; this reconciliation is known as the Paschal Mystery .  The Greek term "Christ" and the Hebrew "Messiah" both mean "anointed one", referring to the Christian belief that Jesus' death and resurrection are the fulfilment of the Old Testament's messianic prophecies .