Here is the thing, folks. The book of Acts simply must be looked at with missiological eyes. The usual NT scholar does not do this. As a missionary on furlough, I once took a 4 credit MA level course in Acts. The prof (a good man, but not a missiologist) spent literally hours on the North and South Galatian theories, but never once mentioned doing cross-cultural evangelism or planting churches, yet these two subjects are exactly what the whole book of Acts (and thus apostleship) is about! Remember that the original Greek title was "Acts of the Apostles." Don't even read the book of Acts if you are not thinking of world missions, or you will get it wrong.
As I did on the previous thread, I'll post here what some leading missiologists have said about this issue, adding some I didn't mention previously:
A. “The word missionary comes from the Latin word
mitto, which means ‘to send.’ It is the equivalent of the Greek word
apostello, which also means ‘to send.’ The root meaning of the two words is identical.”
J. Herbert Kane,
The Making of a Missionary (Grand Rapids: Baker, 1975), 13.
B. “To whom should the term 'missionary' be applied? Obviously today's missionary is not in the same class with the twelve apostles, who must forever remain in a class by themselves (Lk 22:30; Re 21:14). They do, however, have much in common with the 'second-string' apostles who were sent out by the various churches on teaching and preaching missions to all parts of the Roman Empire.”
Ibid, 14.
C. “Paul stated that not only was he ordained a preacher, he was also an apostle. Paul knew that he was an apostle (see Acts 22:21; I Tim. 1:1). A missionary is, in a sense, an apostle. The word “missionary” is the exact Latin equivalent for the Greek word “apostle.” Both words have the same meaning—“one who has been sent.” Jesus said to His disciples after His resurrection, “As my Father hath sent me, even so send I you” (John 20:21).”
G. Christian Weiss,
The Heart of Missionary Theology (Lincoln, NE: Back to the Bible, 1976), 66-67.
D. “The very name of the book (of Acts) is in keeping with this through. The word ‘apostle’ (from the Greek
apostello—‘I send’) is a synonym for ‘missionary’ (from the Latin
mitto—‘I send’). An apostle, or missionary, is a ‘sent-one,’ and so the book might just as accurately have been called ‘The Doings of the Missionaries.’”
[4]
Robert Hall Glover,
The Bible Basis of Missions (Chicago: Moody Press, 1946), 26.
E. “After a careful examination of the Biblical data James Hastings in his Dictionary of the Apostolic Church comes to the following conclusion: ‘The cumulative effect of the facts and probabilities stated above is very strong—so strong that we are justified in affirming that in the New Testament there are persons other than the Twelve and St. Paul who were called apostles, and in conjecturing that they were rather numerous. All who seemed to be called by Christ or the Spirit to do missionary work would be thought worthy of the title, especially such as had been in personal contact with the Master.’ This conclusion is substantiated by the usage of the word apostle for itinerant ministers in the subapostolic age.”
George Peters, "Let the Missionary Be a Missionary,” Bib. Sac. (Oct-Dec. 1965).
F. “In the New Testament there are two kinds of apostles. First, there is the relatively small group of those who were personally chosen and instructed by the Lord. These men held the office of apostle, to which there is no succession. Second, there are those men who had the gift of apostleship and were called ‘messengers
[apostoloi] of the churches’ (2 Cor. 8:23). In this group were included such men as Barnabas, Silas, Timothy, Epaphroditus, Andronicus, and Junias.”
David Hesselgrave,
Planting Churches Cross-Culturally (Grand Rapids: Baker Academic, 2000), 95.