The Catholic Church teaches that divine revelation is transmitted through both Sacred Scripture and Sacred Tradition, interpreted by the Magisterium. Scripture alone (sola scriptura) is not taught in Scripture itself, was not practiced by the early Church, and produces irreconcilable interpretive disagreements.
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped. If Scripture makes us thoroughly equipped, nothing else is needed.
Tradition is merely human opinion that corrupts the pure Word of God. Jesus condemned the traditions of the Pharisees in Mark 7:8.
The early Church relied on Scripture. The Bereans were praised for checking Paul's teaching against the Scriptures (Acts 17:11).
So then, brethren, stand firm and hold to the traditions which you were taught by us, either by word of mouth or by letter.
Sola scriptura faces three fundamental problems: it is self-refuting, historically impossible, and practically unworkable.
It is self-refuting because the Bible nowhere teaches that the Bible alone is the sole rule of faith. 2 Timothy 3:16 says Scripture is 'useful' for teaching, not that it is the only source of teaching. The passage describes Scripture's qualities, not its exclusivity. To derive sola scriptura from this verse requires the very extra-biblical reasoning the doctrine forbids.
It is historically impossible because the New Testament did not exist as a compiled canon until the late fourth century. For over 350 years, the Church taught, baptised, celebrated the Eucharist, resolved doctrinal disputes, and died for the faith without a New Testament canon. The Church that compiled the Bible is the same Church that claims authority to interpret it.
It is practically unworkable because it produces contradictory interpretations with no mechanism for resolution. Baptists, Presbyterians, Lutherans, Anglicans, and Pentecostals all claim to follow the Bible alone and reach mutually exclusive conclusions on baptism, the Eucharist, church governance, and soteriology. If the Bible were self-interpreting, it would not produce 30,000 denominations.
The Catholic Church does not diminish Scripture. Dei Verbum calls it the 'food of the soul' and urges all Catholics to read it. The issue is not whether Scripture has authority but whether it has authority apart from the Church that produced and interprets it.
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