Mark:3:13-19 ---This is my take on this scripture NKJV
The Twelve Apostles
13 Q)'>And He went up on the mountain and called to Him those He Himself wanted. And they came to Him. 14 Then He appointed twelve, that they might be with Him and that He might send them out to preach, 15 and to have power to heal sicknesses and to cast out demons: 16 Simon, to whom He gave the name Peter; 17 James the son of Zebedee and John the brother of James, to whom He gave the name Boanerges, that is, “Sons of Thunder”; 18 Andrew, Philip, Bartholomew, Matthew, Thomas, James the son of Alphaeus, Thaddaeus, Simon the Cananite; 19 and Judas Iscariot, who also betrayed Him. And they went into a house.
unsafe says ----
Knowing what these 3 word mean here is important to understanding where the power comes from in the scripture -------
The Greek word used for call here in this scripture is
proskaleó: to call to
Original Word: προσκαλέω
Part of Speech: Verb
Transliteration: proskaleó
Phonetic Spelling: (pros-kal-eh'-om-ahee)
Definition: to call to
Usage: I call to myself, summon.
unsafe says ---
So first HE calls the ones He wants -------then He appoints them ------so appoints here is the Greek for appoint means ordained ----- Mark 3:14, AV, poieo, "to make," is translated "ordained" (RV, "appointed").
Define ORDAIN | Definition for word ORDAIN Vine's Greek New Testment Dictionary ORDAIN
KJV Dictionary Definition: ordain
ordain
ORDA'IN, v.t. L. ordino, from ordo, order.
1. Properly, to set; to establish in a particular office or order; hence, to invest with a ministerial function or sacerdotal power; to introduce and establish or settle in the pastoral office with the customary forms and solemnities; as, to ordain a minister of the gospel.
unsafe says -----posting here
So only after they are ordained are they given power -------Greek word here and meaning for power
dunamis: (miraculous) power, might, strength
Definition: (miraculous) power, might, strength
Usage: (a) physical power, force, might, ability, efficacy, energy, meaning (b) plur: powerful deeds, deeds showing (physical) power, marvelous works.
HELPS Word-studies
1411 dýnamis (from 1410 /dýnamai, "able, having ability") – properly, "ability to perform" (L-N); for the believer, power to achieve by applying the Lord's inherent abilities. "Power through God's ability"
(1411/dýnamis) is needed in every scene of life to really grow in sanctification and prepare for heaven (glorification).1411 (dýnamis) is a very important term, used 120 times in the NT.
unsafe says ------
So we see here that blackbelt1961 is right in what he says ------all power comes from and through God ------
What's interesting unsafe is that, as you rightly point out - he calls them. They don't up and volunteer.
This is still the way today with Christ and his followers.