Summary
Highlights
Sola Scriptura is the foundational doctrine separating Protestants from other Christian traditions, defining what is obligatory for Christians to believe based on divine revelation. Protestants reject many doctrines (e.g., Mary's bodily assumption, praying to deceased Christians, seven sacraments) because they lack foundation in divine revelation, viewing them as later human accretions.
Sola Scriptura asserts that Scripture is the only infallible rule for the church, meaning it's the only authority that cannot err. It's crucial to distinguish infallibility (incapable of error) from authority (offering binding decisions). While other entities like church councils or pastors hold authority, they are fallible and subordinate to Scripture. Another misconception is that Sola Scriptura demands all doctrines be explicitly stated in the Bible; instead, it allows for doctrines deduced by 'good and necessary consequence' from Scripture.
Scripture's nature is as the 'inspired word of God,' meaning it is 'God-breathed' (2 Timothy 3:16) and originates directly from God, even if delivered through human mediums (2 Peter 1:21). This divine origin makes Scripture infallible, as God is omniscient and perfect. This understanding of Scripture's unique ontological nature is largely agreed upon by Roman Catholic and Eastern Orthodox traditions, which distinguish Scripture as divine speech from other infallible pronouncements like papal statements or magisterial interpretations.
The role of Scripture is foundational to the life of God's people, and other legitimate authorities are subordinated to it. Jesus's prioritization of Scripture over tradition in Matthew 15 and Mark 7 exemplifies this principle. He challenged the Pharisees' 'traditions of men' that made void the word of God, illustrating the need to test human claims against divine revelation. The example of the Bereans in Acts 17:11, who examined Scriptures daily to verify Paul's teachings, further highlights this principle.
The core question becomes: what other rule for the church could be comparably infallible to the inspired Word of God? Oral apostolic traditions are problematic due to fallible transmission processes (the 'telephone game'), as seen in early church disputes over the date of Easter or rebaptism. Post-apostolic mechanisms of infallibility (like papal infallibility or ecumenical councils) also face challenges. There's no Old Testament precedent for ongoing infallible offices, nor is such an office explicitly envisioned in the New Testament. Historically, the concept of ecclesiastical infallibility developed slowly and is problematic due to inconsistencies and the 'elasticity' of supposedly infallible teachings over time.
In summary, Scripture is an infallible rule for the church due to its nature and role. There is no other infallible rule because oral traditions are fallibly transmitted, and post-apostolic infallibility lacks historical, biblical, and logical foundation. Therefore, if Scripture is the only infallible rule, Sola Scriptura stands as the only logical conclusion.