It is sometimes claimed (for example, by the Mormon church, and by the Christian organization known as Gospel Outreach) that God intends for the church to have the office of apostle operative today. The Scriptures, however, indicate that the apostleship was strictly a first-century office.
Jesus trained the Twelve to be preachers, teachers, and evangelists for Him after His death and resurrection (John 14:17; Matthew 16:18-19; 18:17-18; etc.). The apostles would speak with authority, not only because they had the Holy Spirit teaching them, but also because they were eyewitnesses of the saving events of Christ's death and resurrection (John 14:26; 15:26-27).
The apostles, therefore, were trained by Jesus to play a vital and unrepeatable role in the history of the church. While the Holy Spirit still dwells in the church, there are no more apostles, since an apostle was required to have been an eyewitness of the resurrected Christ (Acts 1:21-26; 5:32; Luke 1:1-4; Ephesians 3:4-5; I Corinthians 9:1). Given the fact that no one living during the past eighteen centuries has seen the risen Jesus (despite the claims of persons such as Joseph Smith), it is impossible that during this period we should have "apostles."
The New Testament indicates rather clearly that the apostleship did end in the first century. In Paul's recounting of the resurrection appearances, he ends with his own, saying, "and last of all, as to one untimely born, He appeared also to me" (I Corinthians 15:7). Elsewhere, Paul speaks of the church as "having been built upon the foundation of the apostles and prophets, Christ Jesus Himself being the cornerstone" (Ephesians 2:20). Just as we do not lay new cornerstones from time to time to replace the old one, so too, we do not lay a new foundation of apostles and prophets over and over. The foundation of the apostolic witness to Christ and the prophetic revelations which pointed to and interpreted the saving acts of Christ has been laid; it does not need to be laid again. Whenever teachers come along with "new revelations from God," they are attempting to lay a foundation which has already been laid (see I Corinthians 3:11).
Lastly, I rely not only on my pastor's teachings, but my own personal in depth study. In Acts 16, Paul commends the Bereans the they " received the word with all readiness, and searched the scriptures daily to find out if these things were so." Therefore, that is what I do. I search the scriptures for confirmation.
Lastly, as far as the completion on the Bible, I believe the Apostle John makes it very clear when he speaks for God in the book of Revelation. Revelation 22:18 states, "If anyone adds to these things, God will add to him the plagues that are written in this book..." Sounds complete to me.
Hope that helps. On a lighter note, what's your favorite trick?