He’ll straighten us out? Didn’t Jesus say that He would send the Holy Spirit to guide us in truth? And doesn’t the Holy Spirit reside within the Church that Jesus Himself set up? It certainly doesn’t reside with each and every believer with a Bible, because believers believe in opposite things - infant baptism vs. adult baptism, no blood transfusions vs. doctors are necessary, snake handlers, etc. No, the Holy Spirit is what straightens out poor doctrine, like adding and subtracting from the Bible, like Luther did.
Yes, He did say that, and the Holy Spirit
is guiding us into all truth. This is deeply eschatological. Just as revelation is progressive so is our apprehension of it.
A person can be in a right relationship with God and be wrong about a great number of things. The point is not to be immediately and irrevocably correct so much as to remain humbly open to growth and to the Spirit’s leading.
There are theological Rubicons of course. There are dogmas of the faith.
I believe in the Trinity though there is no explicit mention of it in the Bible.
Does this mean that Sola Scritpura is wrong?
No, all it means is that the doctrine that God is triune is something that had to be understood from Scripture, not explicitly read in it. I believe that the only way to make sense of the God of the Bible is to understand Him to be a Trinity just as Nicaea concluded.
This is a dogma. It won’t change because it is in the Bible (again, not explicitly stated) but the Bible does teach that the Father is God, the Holy Spirit is God and Jesus is God and yet, it also teaches that God is One.
Any understanding of this which would deny the doctrine of the Trinity as we have it (modalism, tritheism, etc.) would violate some clear teaching about God which we
can find in the Bible.
The Nicene fathers did a superb job of interpreting the Bible and giving us a definition during a time when all this was being questioned.
But this does not mean that the same solution (especially in a divided church) can or ought to be applied to every question.