With this question, two things come to mind: (1) Its origin, and (2) Its authority. First, the Bible indicates that although human authors penned the sacred writings, God is the ultimate author (2 Timothy 3:16; 2 Peter 1:21). Second, the Bible’s authority does not rest on its human authors but its divine author, God Himself (Ibid). This fact is what makes the Bible authoritative. Its authority lays on its divine origin—God.
The Bible as the authoritative Word of God means that it should be our basis in all areas of life, faith and practice. In my own Christian life and pastoral ministry, it is central. It is my authority and the authority by which to God’s people because it is God’s Word. I take my calling as a minister of the gospel seriously in view of who God is and His Lordship over all.