Jesus went up the mountain and summoned those whom he wanted
and they came to him.
He appointed Twelve, whom he also named Apostles,
that they might be with him
and he might send them forth to preach
and to have authority to drive out demons:
He appointed the Twelve:
Simon, whom he named Peter;
James, son of Zebedee,
and John the brother of James, whom he named Boanerges,
that is, sons of thunder;
Andrew, Philip, Bartholomew,
Matthew, Thomas, James the son of Alphaeus;
Thaddeus, Simon the Cananean,
and Judas Iscariot who betrayed him.
3:13 He went up the mountain: here and elsewhere the mountain is associated with solemn moments and acts in the mission and self-revelation of Jesus (Mk 6:46; 9:2–8; 13:3). Jesus acts with authority as he summoned those whom he wanted and they came to him.
3:14–15 He appointed twelve [whom he also named apostles] that they might be with him: literally “he made,” i.e., instituted them as apostles to extend his messianic mission through them (Mk 6:7–13).
3:16 Simon, whom he named Peter: Mark indicates that Simon’s name was changed on this occasion. Peter is first in all lists of the apostles (Mt 10:2; Lk 6:14; Acts 1:13; cf. 1 Cor 15:5–8).
The Twelve chosen by Jesus receive a specific vocation to be “people sent out”, which is what the word “apostles” means. Jesus chooses them for a mission to make disciples of the Lord (to teach) all nations, sanctifying and governing the believers.
The Great Commission is given to all disciples of Jesus Christ. It was originally given to Jesus’ first disciples. But, because it tells them to teach disciples to obey everything they were taught by Jesus, it is perpetual.
This is the Church’s mission; as such, it is our mission. ALL of us. And while we’re not all called to be missionaries in foreign lands, we are all called to do our part according to our state in life to give witness to the truths of our One, Holy, Catholic, and Apostolic Faith. We are supposed to bring the light of Christ into the world, to preach the saving mission of His Church from the housetops. So shine your light today!
May the virtues of faith, hope, and love go with you today – DV.
 Donald Senior, John J. Collins, and Mary Ann Getty, eds., The Catholic Study Bible, 2nd Ed.: Notes, 2nd ed., vol. 2 (New York: Oxford University Press, 2011), 1406.