All that mankind thinks and does is based on some kind of authority. It is present and presumed, regardless of any stated acknowledgment. In religion and spiritual matters, authority may be rooted in a particular denominational creed, a single individual or designated group of individuals, or tradition(s). It might even come from the world, such as science, or even from within man (his own authority).
The Bible Study Framework and this site, Scripture interprets Scripture, recognizes the Bible, God’s word, as our sole governing authority for all spiritual and secular matters in this world.