Without the Holy Spirit, we cannot understand Jesus. In his life the presence of God’s Spirit, whom we call the Holy Spirit, was manifest in a unique way. [689-691,702-731]
It was the Holy Spirit who called Jesus to life in the womb of the Virgin Mary(Mt1:18), endorsed him as God’s beloved Son (Lk 4:16-19), guided him (Mk 1:12) and enlivened him to the end (Jn 19:30). On the Cross, Jesus breathed out his Spirit. After his Resurrection, he bestowed the Holy Spirit on his disciples (Jn 20:22). At that the Spirit of Jesus went over to his Church:” As the Father has sent me, even so I send you”(Jn 20:21)
