Even as Jesus Christ was the Father's gift to the church, Christ's gift to the church is the ministry. Now, for what reason? Notice how specific this is.
We'll confine ourselves here to general statements regarding the ministry's area of authority. It is in the equipping of the saints for the work of the ministry (or, serving) and for the edifying of the body of Christ.
Equipping is interesting in what the word means. It means, to set in order. In other words, it is saying that something is not aligned properly, and it needs to be realigned, and put into the proper alignment.
What is out of line is our knowledge of God, our knowledge of truth, our knowledge of His way of life. Our character is out of line. And so, God has given a gift to the church in the form of the ministry, to help put people in right alignment with God.
They will therefore be equipped for the work of the ministry—which is a work of service. Serving God. Glorifying God in one's witness. That might include everything from preaching the gospel in evangelistic settings, or administering to local congregations.
Now, edifying means "to promote the spiritual growth of." It becomes very clear that the ministry's area of authority has to do with teaching. There is administrative responsibility as well, but the administrative responsibility has to do with the work of the church. It does not have to do with having magisterial authority in people's lives—dictating to them about what they can do, and what they cannot do. The minister is a teaching machine. That's where his authority lies.