"The law of the Lord is perfect, restoring the soul; The testimony of the Lord is sure, making wise the simple. The precepts of the Lord are right, rejoicing the heart; The commandment of the Lord is pure, enlightening the eyes." (Psalm 19:7-8)
"Simon Peter answered Him, “Lord, to whom shall we go? You have words of eternal life." (John 6:68)
"For the word of God is living and active and sharper than any two-edged sword, and piercing as far as the division of soul and spirit, of both joints and marrow, and able to judge the thoughts and intentions of the heart." (Hebrews 4:12)
"and that from childhood you have known the sacred writings which are able to give you the wisdom that leads to salvation through faith which is in Christ Jesus." (2 Timothy 3:15)
"All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; so that the man of God may be adequate, equipped for every good work." (2 Timothy 3:16-17)
"for you have been born again not of seed which is perishable but imperishable, that is, through the living and enduring word of God." (1 Peter 1:23)
If Roman Catholic officials are indeed correct in regards to the Bible being a dead letter, then it surely is odd that it proclaims itself to be a living, powerful, and even lucid guide for the average reader. The quoted excerpts above from Catholic literature can hardly be reconciled with what divine revelation proclaims regarding itself. The two are diametrically opposed to each other in this case. The Word of God obviously does not portray itself as needing to be unpackaged by some religious organization as to its meaning. This is ironic because Church of Rome publicly proclaims deep, heartfelt reverence for the Bible.
Whenever the self-sufficiency of Scripture gets rejected, whatever it affirms, opposes, or says in general becomes irrelevant. This is a door to heresy. For proof of this, all that one has to do is look at all the abhorrent doctrines taught by groups who adamantly deny Sola Scriptura such as the Jehovah's Witnesses and Mormons. Groups like these are in much worse shape than anybody who relies on (with an open and prayerful heart) Scripture alone for discerning truth from error. One can also take the time to examine apostate denominations that reject biblical doctrine.
Never once does Scripture present itself as needing to be interpreted by some divinely appointed church hierarchy. Who infallibly interprets the words of the infallible interpreter when people still fail to grasp allegedly infallible dogmas? If disagreements in interpretation of the Bible prove it to be obscure, then is God's existence proven to be obscure just because atheists disagree with us on that matter (Romans 1:18-20)?