Seriously.... "maybe you should tell us what authority is so great to judge whether that "voice" you like to refer to is God's, your own or anothers?
None of you proposed a solution? Here I'll provide another clue, another piece of the puzzle. I will simply explain why Sola Scriptura is a logical contradiction. Like all my observations, this is extremely simple stuff.
SS regards the Bible as the only final authority for both doctrine and practice. Therefore a proposed mandate is merely a
suggestion, it doesn't actually count as a real
imperative until we have located an authoritative basis for it in Scripture. Now here's the problem. If all imperatives must be founded upon Scripture alone, from where did you and I obtain the imperative to accept the Bible as inspired? Surely we cannot rationally claim, “I accept the Bible as inspired because it claims to be.” Nor is it rational to accept the Bible on a blind leap of faith. If blind faith were commendable, the Christian would be perfectly warranted in suddenly converting to Islam on blind faith.
On what basis/ authority, then, does a typical Christian accept the Bible? Reason? History? Blind faith? The Roman Catholic says, "On the authority of the church!" Regardless of the Christian's particular choice of basis/authority, this selected basis/authority now functions as a higher authority than the Bible because it dictated his decision to accept or reject the Bible. For example suppose I accepted the Bible on the basis of Reason, but tomorrow my reasoning leads me to conclude that Islam is a more rational choice. In that case I will abandon the Bible in favor of the Koran, thereby confirming that Reason is, for me, a higher authority than the Bible, since it governs my willingness to accept or reject the book. Thus the Bible can never be legitimately construed as our highest authority because some
higher authority clearly dictates our decision to accept or reject this book.
The next clue, then, is to simply ask yourself: on what basis/authority do I accept the Bible? This might help you understand how an authoritative voice operated in all the prophets such as Abraham, and still in all the angels today.