(Chapters twenty-one and twenty-two deal with the literal versus non-literal interpretation of Scripture).
There is nothing significant in the last passage for this debate (other than what has already been said) except that most commentators seem to ignore it. Yes; they ignore the most climatic, hopeful, and wondrous passage in the Bible. So much “ado” is spent on speculations and sensationalisms, that the things that are really important are ignored. In the worse way, I think it is the fear of conviction that causes many commentators to manipulate His Word—especially with Revelation. In this way, they can put the focus on elsewhere, as Satan likes us too, so what God clearly calls us to can be rationalized away or ignored, so they would not be convicted of it. Of course, if you read any of Revelation, you will see what God thinks of this practice. In the best way, it seems that many people like to come up with their own theories, which is OK to a point, but then to sensationalize them and belittle those who do not hold to their vain speculative and even sometimes aberrant views that are not even found in the passages is not OK. Thus, when they get to this passage, conviction hits home; God Himself tells us clearly, do not do it! Oops!
What does it mean to you to be content in Christ? Why are so many of us miserable, even though we are Christians? How does this compare to not being a Christian and being disillusioned by the ways of the world? What can you do better to be content in Him?