Man is a fallen creature. Since the ejection from Eden, mankind has been foul and corrupt, no matter how strong a desire for divine fellowship.
Man corrupts everything he touches.
With that in mind, I am hesitant to simply accept what is taught by man, what is said by man, what is done by man. So when something is taught about the Bible, and it is taught by Man, it is insufficient.
Language is a tool of man. God’s Word is written in language because we have no other way by which it can be communicated to us. As such, while the WORD of God is perfect, our ability to take it in is not perfect. That is where the understanding comes in.
Faith, Tradition and Reason. Together these pillars hold me up that I may live free and unafraid in my faith.
And again: Man is fallen and corrupt. With enough time, anything on Earth can be corrupted by man. Gotta use a brain to cut through the mud.
Then discard the doctrines of men found in the RCC and return to the authority of God's word.
And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus. 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 perfect, throughly furnished unto all good works." -- 2 Timothy 3:14-17"But continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them;
Men either believe God or they don't.
"...holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus"
The Bible.
Faith, Tradition and Reason. Together these pillars hold me up that I may live free and unafraid in my faith.
Faith is a free gift from God to whom He will.
Tradition was denounced by Jesus Christ nearly every time He mentioned the word.
And reason augments our understanding only if God has renewed our mind to make sense of His words, His will and His purpose.
The assurance you're apparently seeking is found in God's grace alone.
"Grace is poured into thy lips: therefore God hath blessed thee for ever." -- Psalms 45:2