Claim: "The Scriptures are sufficient to function as a Rule of Faith."
Challenge: Prove it!
I can't think of any necessary message which is other or better than all I have found in God's word. But there are things which words alone can not tell us, which we need to find out how to do, with God. So, this would be how I personally understand sola scriptura. But I get the impression that there are people saying "yay sola scriptura" but they need to find out much more of what the Scriptures are saying and what they really mean. Their attention can be "sola how I understand and represent scriptura", but their attention is limited and isolated to what is much less than God's word is talking about.
If I may > below, I am not trying to directly prove or disprove anyone's beliefs, but I would like to offer a few things >
"All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work." (2 Timothy 3:16-17)
And these Scriptures say we need >
"faith working through love" (in Galatians 5:6)
So, I see how we need God's love to have us living all He knows His word means. Correct words alone do not . . . can not . . . tell us all God means by each scripture. Every scripture can somehow help us to love the way God's word means, since all His word comes from His love for Jesus and us. But we need how God's love has us actually discovering all His word means. The scriptures help, but God proves Himself.
So, I would say we need the correct words and how God demonstrates in us and our lives His interpretation which is deeper than words and better than we can understand unless He actually demonstrates (1 Corinthians 2:4).
And we ourselves are His living message >
"you are an epistle of Christ" > in 2 Corinthians 3:1-3.
So, God's word is not only written in the Scriptures, but in our hearts. People need to read us
>
"known and read by all men" > 2 Corinthians 2:1-3. And our Apostle Peter even says how wives
"without a word" can win disobedient husbands > 1 Peter 3:1-4.
Each of us, then, has ability with God to minister His own grace so we grow in Jesus and how Jesus in us has us loving >
"Let no corrupt word proceed out of your mouth, but what is good for necessary edification, that it may impart grace to the hearers." (Ephesians 4:29)
"speaking the truth in love" that we
"may grow up in all things into Him who is the Head, that is---Christ---" (in Ephesians 4:15)
So . . . scripture is not enough > it needs to be ministered
"in love". And the love ministering is spreading God's own things which change us to be and to love like Jesus who is God's Word.
So, scripture is not only for getting correct ideas, but God's word is for ministering His own grace which changes us to become and to love like Jesus while submitting to how our Father rules us and personally guides us in His own peace > Colossians 3:15.
And you might consider how a number of letters in the Bible start with blessing us with
"grace" and
"peace" > for example Ephesians 1:2. We need how God's grace and peace have us correctly understand His word, and how grace and peace share with us all the good which His words are talking about . . . demonstrating.
And so we need
"examples" who are samples who can spread to us how God's grace and peace is blessing them >
"nor as being lords over those entrusted to you, but being examples to the flock." (1 Peter 5:3)
We need leaders who are samples of all God means by His word > how we are becoming conformed to the image of Jesus who is the Word.
It was not enough to have God's word, then, I now consider. I see how ones can be fabricating word idols, and saying they are sola scriptura, but their doctrinal word idols are not resulting in people being and loving like Jesus. Instead, God uses people to minister the grace and peace which His words mean.
The people needed the Apostles who were examples, for example >
"we were gentle among you, even as a nursing mother who cherishes her own children" (in 1 Thessalonians 2:7).
Here I think we can see how the message was not enough. They needed how the Apostles personally related with them, so they could get the love meaning of God's word. They so personally . . . tenderly . . . shared with God's ministers.
But now it seems we have people who can be so distant, only handing out doctrines and arguments, and not able to personally and tenderly share with ones they are reaching to. In order to love intimately and tenderly >
"without complaining and disputing" (Philippians 2:13-16) > we need to become deeply stable and strong in God's way of loving, so things can't get the better of us and get us bitter and fighting and biting.