Those verses refer to the apostles and to the ordained priests; 1 John 2:27 even expressly so. There is no scripture that condones private interpretation, and 2 Peter 1:20 specifically forbids it.
"Those verses refer to the apostles and to the ordained priests; 1 John 2:27 even expressly so"
It's been a hard day so I might be a little slow, but where does it say these verses apply to apostles and to the ordained priests? The gospel was written to the assemblies at large and John's letters as well as to Timothy were written for the benefit of the assemblies. Are you saying that these books have no relevance for the individual believers? Are we to throw away our Bibles and just listen to the tapes of the professionals?
"Above all, you must understand that no prophecy of Scripture came about by the prophet's own interpretation."
This clearly means that the words are inspired not by the prophets but by the inspiration of the Holy Spirit. When Peter conveys the teachings that he received directly from Jesus they were not Peter's thoughts but were the thoughts of God Himself.
Which of course is your own personal interpretation of 2 Pet 1:20.
From Albert Barnes' Commenatary:
Is of any private interpretation - The expression here used (ἰδίας ἐπιλύσεως idias epiluseōs) has given rise to as great a diversity of interpretation, and to as much discussion, as perhaps any phrase in the New Testament; and to the present time there is no general agreement among expositors as to its meaning....