Acts must also be seen as a transitional book.
It bridges the gap between the Gospels and the Epistles, between the ministry of Christ and the activities of the apostles.
It is therefore an introductory book, full of historical background.
Great care must be exercised lest one build his entire theological position of doctrine and practice upon what is found in its chapters.
Doctrine must be primarily based upon the Epistles where apostolic teaching is spelled out in detail.
Many events recorded in Acts were never intended to become a pattern for every generation of Christians to follow.
For instance, no one should expect to be personally taught by the resurrected Christ as were the apostles (1:1–3). The phenomena of wind, cloven fiery tongues, and tongues-speaking should not be anticipated by the believer in the entrance of the Holy Spirit into his life (2:1–4).
Christians do not have to sell their possessions as the early converts did (2:45; 4:34). Deliberate liars are not immediately struck dead today (5:1–11). Imprisoned Christians should not expect to be released by an angel (5:19; 12:7) or by an earthquake (16:26).
Paul himself later experienced at least three other imprisonments in which no angel or earthquake came to his rescue. Should martyrs today expect to see the resurrected Christ as Stephen did (7:55)?
Should soul winners expect to be transported from one geographic location to another by the Spirit as was Philip (8:39)? Should people expect to see the resurrected Christ before their conversion as did Paul (9:1–6)?
Should unsaved men expect an angelic invitation informing them what evangelist to secure as did Cornelius (10:1–8)? The answers to these questions are obviously negative.
In Acts God was doing a new thing; He was starting the church age which has lasted now for almost two thousand years.
In the divine introduction were many unusual signs and miracles that were never designed to be sought after by later Christians. God practiced this same principle in earlier ages.
When the law was given to Moses originally the event was accompanied by thunder, lightning, smoke, and an earthquake (Exod. 19:16–18); however, when the law was given the second time, these phenomena were not repeated (Exod. 34).
Why? Because the age of the law had already begun. God nourished the children with daily manna for forty years, but once the Israelites were in Canaan, the manna stopped. They were to work the land and to trust the Lord for its increase; they were not to expect a repetition of the manna provision.
Robert G. Gromacki, New Testament Survey (Grand Rapids, MI: Baker Academic, 1974), 154–155.