Knowing this first, that no prophecy of the scripture is of any private interpretation.
2 Peter 1:20
In order for an interpretation of a Scripture passage to be valid, it must be PUBLIC. The particular interpretation must be conclude-able by different men of God, separately and independently through cross examination of other scriptures (comparing spiritual things with spiritual, 1 Cor 2:15), with the guidance of the Holy Ghost alone, not tainted with doctrinal or other persuasions. This is similar to the scientific method, where an experiment must be repeatable, producing the same results with the same parameters, every time.