Men are called to read the Scriptures, and if they've been given eyes to see and ears to hear and a new heart with which to believe in Jesus Christ, all as gifts of free, unmerited grace from God alone, they will understand God's word and His will for their lives.
A behemoth, authoritarian magisterium far across mountains and oceans is not required for a man to know what God wants for him.
All that is required is the guidance of the indwelling Holy Spirit which is a gift from God.
Nothing "private" about it. But very "personal."
And Christ's church on earth is made up of like-minded "personal" believers who come together to worship God and to preach the Gospel of Jesus Christ.
Why did St. Paul write the fourteenth chapter of I Corinthians, then? Shouldn’t the Spirit interpret, then? Or did St. Paul err in preaching that prophesy independent of Scriptures was profitable?
Where did anyone in Scripture claim that all members of the Church would be infallible in their interpretations?
I Cor 12:7-11
“To each individual the manifestation of the Spirit is given for some benefit. To one is given through the Spirit the expression of wisdom; to another the expression of knowledge according to the same Spirit; to another faith by the same Spirit; to another gifts of healing by the one Spirit; to another mighty deeds; to another prophecy; to another discernment of spirits; to another varieties of tongues; to another interpretation of tongues. But one and the same Spirit produces all of these, distributing them individually to each person as He wishes.”