When you are confident that you are dealing with a legitimate unit of text, then you can be confident that there is unity to the idea contained in that text.  You will often need that confidence.  Usually a passage doesn’t offer its unity on the lowest branch.  It can take work and real wrestling in order to determine the united single main idea of a passage.

Here’s one approach:

1. Read the passage multiple times. Early on you probably need to make a note of questions you have on the first run through since these will be the questions listeners have as they hear it on Sunday.  However, you can’t prepare a message after one read through.  Soak in the passage.  Study it.  Revisit it. And again.

2. Answer the question – “what’s this passage about?” Not the easiest question, but an important one.  It’s asking not for specific detail (such as “what stood out?” or “what’s your favourite bit?”) but for general overview observation – “what’s it about?”  You may have two or three things that the passage is dealing with.  For instance, a friend of mine is looking at Isaiah 6.  Early thoughts are that it is about God’s majesty and holiness, but it’s also about Isaiah’s call into ministry, plus there’s the often neglected last part of the chapter too.

3. Consider whether the answers you have are roughly equal in weight, according to the measure of the passage. It may be that one part has made it onto your list because you’ve heard about it before, it’s familiar, you like it, etc.  But is it really a fair answer to the question “what’s the passage about?”  If it is really a subordinate issue, tentatively drop it.  If not, if each element is genuinely weighty in the passage, then . . .

4. Consider how the elements might be combined, rather than viewed exclusively. Perhaps Isaiah 6 is not about God’s majestic holiness or Isaiah’s call into ministry, but rather a combination of the two?  After all, isn’t Isaiah’s call in the context of an encounter with God?  How about the message he’s given . . . how does that fit?  Is there a contrast between Isaiah’s responsiveness and the rest of the people of unclean lips?  Keep wrestling.

Next time I’ll suggest a few other approaches if this one isn’t working.