Here's an important question worth asking: Whose interpretation is authoritative?
-A8
I trust the Holy Spirit to speak to me through Scripture. And as evidence of that process, my life is full. I sleep well.
When in doubt, I speak with other believers who give their input of the Scriptures. From this I learn to correctly discern the word of God. It's just not all that difficult. In fact, God has made His will pretty clear in my life, as He does in the lives of all who trust in His word and in the one-time, perfect, accomplished atonement of Jesus Christ.
RCs seek authority through their church, through the vagaries of men in gaudy robes and high hats, as if they could possibly speak for God Himself. This type of delusion is one from which I thank God daily I do not suffer.