The teaching of Christ and the first apostles as documented in the Bible is sufficient to guide the believer on what to believe.
If the
Bible alone was sufficient to guide the believer then we would not have thousands of faith groups teaching contradicting doctrine. Such as, bible alone/not bible alone, individual believer interpretation of bible/denomination interpretation of bible. Faith alone/not faith alone, baptism necessary/baptism not necessary, infant baptism/no infant baptism. Speaking in tongues necessary/speaking in tongues not necessary, OSAS/can lose salvation. Trinity/no Trinity, Tradition/all Tradition now in bible. The list goes on and on. Point is how do you know which is the true gospel and which is the false gospel. Unless you believe truth is not relevant and only in the eye of the beholder both can’t be the gospel truth. Yet all claim the bible and the Holy Spirit as guiding them whether individual believer or faith group.
The Bible might be materially sufficient but cannot be correctly interpreted apart from, Divine Tradition as lived out by the apostolic fellowship, and discerned by the teaching authority (magisterium) Christ
sent to
teach the whole world and promised to be with
till the end, through successors (bishops) appointed by the apostles and will continue till the end.
[2Tm3:10 But **thou hast fully known my doctrine, manner of life, purpose, faith, longsuffering, charity, patience, 11 Persecutions, afflictions, which came unto me at Antioch, at Iconium, at Lystra; what persecutions I endured: but out of them all the Lord delivered me. 12 Yea, and all that will live godly in Christ Jesus shall suffer persecution. 13But evil men and seducers shall wax worse and worse, deceiving, and being deceived. 14 But
continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them; 15 And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus. 16 **All scripture is given by inspiration of God, and is profitable for **
doctrine, for
reproof, for
correction, for
instruction in righteousness: 17
That the man of God may be perfect, thoroughly
furnished unto all good works.]
Paul tells Timothy to continue in the things,
learned and assured of, knowing from whom he learned them. In vs14 Paul is telling Timothy to use both Apostolic Tradition (learned) as well as scripture. Paul also tells Timothy, vs16-17 scripture is
profitable fordoctrine, reproof, correction, instruction in righteousness that the man of God be made perfect furnished for good works. Scripture never says nor implies scripture alone.
Who decides doctrine? Who reproves? Who corrects? Who instructs? in righteousness that the man of God may be furnished unto all good works? The answer follows in the next chapter of 2Timothy.
[2Tm4:1 **I charge thee **therefore before God, and the Lord Jesus Christ, who shall judge the quick and the dead at his appearing and his kingdom; 2
Preach the word; be instant in season, out of season;
reprove,
rebuke,
exhort with all long suffering and
doctrine.]
Paul is instructing Timothy to use his (magisterial) teaching authority along with both Divine Apostolic Tradition, learned from Paul, as well as scripture. So like a three leg stool we need Tradition, Scripture and the Magisterium if you remove one leg it doesn’t function for the purpose it was created.**