What is our authority in issues of doctrine, morals, and daily living? We live in unstable and contentious time. Should we believe what our parents or pastors taught us? How do we respond to contemporary debates over moral issues with political forces pressing us on all sides? What do we do with doctrines that are unpopular? God has provided an answer. His revelation in the Bible is His resource on deciding these issues (Acts 17:11). It is the only inspired and infallible authority for all matters of doctrine and practice. It is the only source that is God-breathed (2 Tim. 3:16-17) and inspired by the Holy Spirit (2 Pet. 1:20-21). Everything that a person must believe in order to be a genuine Christian is found in the Bible. Tradition in the form of confessions and creeds, teaching from family and pastors, etc. is useful, but it is always subordinate to Scripture (Mark 7:9). In all matters of faith and practice, God’s revelation in the Bible is the final arbiter. Human opinions, societies, and governments come and go, but God’s words will always remain (Is. 40:8).
For a more detailed explanation read these blog posts.