The Reformers (Luther, etc.), taught a basic rule of Bible interpretation that they referred to as “The Analogy of Faith”. That is, because God provided the Holy Scriptures as the supreme authority of faith, we are to interpret Scripture by Scripture, NOT by man’s reasoning. The word “comparing” used in this verse, means to compare spiritual things with spiritual so that our thought structures “join together fitly, compound, and combine” to reinforce biblical truth. If I attempt to combine my own “truth” with God’s truth, my thoughts will NOT “join together fitly”; they will be filled with disappointment and disillusionment. Jesus said, “you shall know the truth and the truth shall set you free”, not, “you shall mix my truth with man’s wisdom and come to a compromise that makes sense to you”.
And I thought self interpretation was frowned upon. http://forums.catholic.com/images/icons/icon9.gif
(2 Peter 1-20) - ***Knowing this first, that no prophecy of the scripture is of any private interpretation. ***
*(2 Peter 3-16) - As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction. ***
**(Acts 8-30) - *****And Philip ran thither to him, and read him read the prophet Esaias, and said, Understandest thou what thou readest? And he said, How can I, except some men should guide me? And he desired Philip that he would come up and sit with him. ***