They diligently studied the Word of God. They used references from the Bible to support their preaching. The power of their preaching was derived from the Scriptures. One does not earn a high place before God by appropriating an impressive religious title. When the evangelist is doing the pastoring, God's divine plan is being ignored.
Preachers are to labor in the word, preaching, teaching, exhorting.
We know that Christians in the early church were pleasing God with their worship. If we worship God as they did, we can be sure that God is pleased. When we add to or take away things from the worship service that God ordained, we must fear that our worship is unacceptable, no matter how sincere. Christians there are committed to following the Biblical pattern in worship. Our worship service is patterned after the first century church.