One of the common points of division in the body of Christ, from my own experience, has been theological extrapolation. Calvinists don’t get along with Arminians because of the extrapolation from what is written in the Bible. Don’t get me wrong, logic is important, but it isn’t the be-all, end-all of hermeneutics. You see, if you have only some of the facts, content, culture, history, language understanding and you start to form doctrines you can come up with some errant ideas because you have started to fill in the ‘blanks’ [even if they weren’t blank, but you didn’t study] with something else that you have brought about by deduction. When you have some ideas that work for you, it is probably a great idea to pursue discussions with mature believers and seek out wisdom. Homogeny isn’t always the most important thing (truth is!), but others who have studied a topic may be able to point you towards some verses that will help you in your studies and find a fuller understanding of what the scriptures say on a subject.  Homogeny can also be dangerous because a whole group has agreed on something but not looked into it.  That being said, discussion with other believers is critical.

When you study God’s word there is a term for inserting your own meanings into a text, its called eisegesis (pronounced like ice o’ Jesus, which is probably what Martha was getting when she complained about Mary listening).  It is important to know what the scriptures say and to apply consistent hermeneutics for this very reason.  If you look at a text and are forcing your own modern context and ideas on the text, you’re not learning from God’s word, you’re changing it.  That’s not extrapolation, but its not useful time with the Bible.