This is soooo out of context. Paul, of course, was not talking about the Chirstian Bible, but of the Jewish Bible. There was no Christian Bible for another 350 years after Paul. The Gosples weren't evebn written yet.
Yes ... but they are written now ... and canonized.
Your point seems to be that Paul admonished his hearers to not go beyond what was even a smaller selection of scripture than what we have today.
Do you think that Paul would admonish christians today to go beyond what God has given to us in the scriptures ?
He was talking to well-to-do pagan Greeks and possibly Jews. What would they know of Holy Tradition?
Who would one such as Paul be talking to today ?
Does the majority of the world know of Holy Tradition today ?
Besides, most of the poeple then were illiterate and books were not owned by an average Joe.
Well, it is quite obvious that he was speaking to those who taught in the church (and thus, could read), ... such as Apollos and himself.
Do you believe that Paul would make some different admonition to christian teachers today ?
What Paul was teaching as correct faith was based on his knoweldge and understanidng of the Wisdom and the Truth, not all of which eventually ended up in the Bible.
What Paul was preaching is the Sacred or Holy Tradition. He did not have a Bible, yet he knew what was the correct faith, he already had an auhtoritative knowledge of what the faith should be, what the Lord's Supper represents, and so on.
His successors, the bishops of the Church continued to preach correct faith and idenitfy heresies without a Bible in their hands. The Councils of Bishops at Nicenae canonized the faith in the Creed that was based on the Sacred Tradition, the Wisdom, the Knowledge that our Lord gave his disciples and they to theirs. All that was done without the Bible.
Now that Church is established, now that we know what the True Faith is, the Bible containes sufficient Wisdom and Truth of God for us to know, but the fact that the Bible exists (which is the product of the Sacred Tradition) does not invalidate or eliminate or retire the Sacred Tradition, which remains unaltered.