+Mk 16: 15-20
He said to them, “Go into the whole world and proclaim the gospel to every creature.
Whoever believes and is baptized will be saved; whoever does not believe will be condemned.
These signs will accompany those who believe: in my name they will drive out demons, they will speak new languages.
They will pick up serpents (with their hands), and if they drink any deadly thing, it will not harm them. They will lay hands on the sick, and they will recover.”
So then the Lord Jesus, after he spoke to them, was taken up into heaven and took his seat at the right hand of God.
But they went forth and preached everywhere, while the Lord worked with them and confirmed the word through accompanying signs.)
The New American Bible
The Catechism of the Catholic Church
977 Our Lord tied the forgiveness of sins to faith and Baptism: “Go into all the world and preach the gospel to the whole creation. He who believes and is baptized will be saved.” Baptism is the first and chief sacrament of forgiveness of sins because it unites us with Christ, who died for our sins and rose for our justification, so that “we too might walk in newness of life.”
659 “So then the Lord Jesus, after he had spoken to them, was taken up into heaven, and sat down at the right hand of God.” Christ’s body was glorified at the moment of his Resurrection, as proved by the new and supernatural properties it subsequently and permanently enjoys. But during the forty days when he eats and drinks familiarly with his disciples and teaches them about the kingdom, his glory remains veiled under the appearance of ordinary humanity. Jesus’ final apparition ends with the irreversible entry of his humanity into divine glory, symbolized by the cloud and by heaven, where he is seated from that time forward at God’s right hand. Only in a wholly exceptional and unique way would Jesus show himself to Paul “as to one untimely born”, in a last apparition that established him as an apostle.
670 Since the Ascension God’s plan has entered into its fulfillment. We are already at “the last hour”. “Already the final age of the world is with us, and the renewal of the world is irrevocably under way; it is even now anticipated in a certain real way, for the Church on earth is endowed already with a sanctity that is real but imperfect.” Christ’s kingdom already manifests its presence through the miraculous signs that attend its proclamation by the Church.
Mark the Evangelist
Mark the Evangelist (Latin: Mārcus; Greek: Μᾶρκος; Coptic: Μαρκοϲ; Hebrew: מרקוס Marqos Amharic: ማርቆስ?) is the traditionally ascribed author of the Gospel of Mark. Mark is said to have founded the Church of Alexandria, one of the most important episcopal sees of Early Christianity. His feast day is celebrated on April 25, and his symbol is the winged lion.
.. According to Eusebius of Caesarea (Eccl. Hist. 2.9.1–4), Herod Agrippa I, in his first year of reign over the whole of Judea (AD 41), killed James, son of Zebedee and arrested Peter, planning to kill him after the Passover. Peter was saved miraculously by angels, and escaped out of the realm of Herod (Acts 12:1–19). Peter went to Antioch, then through Asia Minor (visiting the churches in Pontus, Galatia, Cappadocia, Asia, and Bithynia, as mentioned in 1 Pet 1:1), and arrived in Rome in the second year of Emperor Claudius (AD 42; Eusebius, Eccl, Hist. 2.14.6). Somewhere on the way, Peter encountered Mark and took him as travel companion and interpreter. Mark the Evangelist wrote down the sermons of Peter, thus composing the Gospel according to Mark (Eccl. Hist. 15–16), before he left for Alexandria in the third year of Claudius (43).
In AD 49, about 19 years after the Ascension of Jesus, Mark travelled to Alexandria (cf. c. 49 cf. Acts 15:36–41 )and founded the Church of Alexandria – today, both the Coptic Orthodox Church and the Greek Orthodox Church of Alexandria claim to be successors to this original community. Aspects of the Coptic liturgy can be traced back to Mark himself. He became the first bishop of Alexandria and he is honored as the founder of Christianity in Africa.
According to Eusebius (Eccl. Hist. 2.24.1), Mark was succeeded by Annianus as the bishop of Alexandria in the eighth year of Nero (62/63), probably, but not definitely, due to his coming death. Later Coptic tradition says that he was martyred in 68.