God has given us brains to think for ourselves. We do not need Help to understand Scripture.
God had given men brains before He came to teach them Himself, and He came to teach them precisely because their brains could not succeed in finding out the things which were to their peace. If you say that His revealed teachings in the Scriptures together with our brains are enough, those very revealed teachings tell you that they are not. Even in the Old Law God said, “The lips of the Priest shall keep knowledge, and they shall seek the law at his mouth.” Mai. II., 7. In the New Law Christ sent His Church to teach men, transferring to His Church that authority of God once possessed by the Priests of the Old Law. In the New Testament itself we find Philip the Deacon saying to the Ethiopian, who was reading the Scriptures, “Thinkest thou that thou understandest what thou readest?” and the Ethiopian replying, “And how can I unless some man show me?” Act VIII., 30. St. Peter, too, explicitly refutes your ideas. “No prophecy of Scripture,” he writes, “is of any private interpretation.” II. Pet. I., 20.
St. Peter means that the Prophets did not prophesy by their own will, but by the Holy Spirit. He does not refer to interpretation by us.
Your own Protestant Bishop Ellicott says of these verses, “The words private interpretation might seem to mean that the sacred writers did not get their prophecies by private interpretation, but by divine inspiration. But this is certainly not the meaning. The real meaning is that the reader must not presume to interpret privately that which is far more than ordinary human thought.”
Bible Only a false principle, Questions 567-568 from Radio Replies Volume I Copyright © 1938 (by Rev. Dr. Leslie Rumble, M.S.C. and Rev. Charles Mortimer Carty).