Does it matter if you study but you do not obey? No. It is important to study, yes. But it is also important to obey the word of God. Just reading isn’t enough. Being intellecutally aware of God - isn’t enough. Obedience and submission to God is everything.
And yes - that means being obedient and submitting to his Apostles and to their authority. If you believe in yourself, what have you gained? Certainly not Christ.
You keep adding that word where it does not appear. “You must interpret the scriptures, yourself.” According to the gospel of SMVoice.
Then you look at scripture and Paul tells Timothy - to apply what he has learned - from the teachers of the law. None of us can stand alone. We stand with Christ and our brothers and sisters. What does it profit us, if we simply take what we are and put it in, rather than listen to what Christ himself is telling us? Nothing.
And just what is Christ telling you? I’m curious. Just what is “keep adding that word where it does not appear”?? Studying the Word of truth IS being obedient to God. At least that’s what HE said.