So, this section is a good bit larger than some of the previous sections. In spite of the fact that it's without a doubt larger, I think this section is more understandable and cohesive than the previous stuff. So, here are my notes over the stuff. In my opinion, this is where the book gets more interesting. The first part of the book is critical, though, and I can't help but think I haven't done justice to the immense importance that worship plays in the book of Revelation. We see some of that become important in this section as the beasts may very well be talking about 
emperor worship, and the message of John is restoring that worship to who it truly belongs to: God. 
Revelation 11-13
- Worship.  This is one thing that I have managed to leave out of this study up  till this point by accident. I've just now come to realize, upon a  further study of the text, just how important the concept of worship  is in the book of Revelation.    
- What  I had been doing earlier was attempting to “skim” over the many  sections of the text containing worship hymns and worship  narratives, to get to the actual bulk of the story and to infer a  meaning. I've now realized that, through a look at the historical  context of the book of Revelation, that is incredibly mistaken, and  these worship sections provide us a way of understanding the “bulk”  of the story.    
Chapter 11
- John  has just “had his commission renewed” by his previous visitation  by the mighty angel in chapter 10. Chapter 11 picks up after  John is told to prophesy against many (10:11). 
-   We start off with John being given a measuring rod before being told  to measure the temple, altar, and those who are gathered there  (11:1). He is specifically commanded not to measure the court  outside of the temple because that will be trampled or destroyed  (11:2).    
-   Two “witnesses” come into the scene and they are to prophesy for  1260 days or ~3.5 years (11:3).    -    Notice that the number of years they are to prophesy is exactly   half of seven, the number of completeness. This seems to symbolize   “radical” incompleteness or something far from complete. 
-    Though they are left unnamed, lots of speculation exists about   their identity or their exact role. 
 
-   They are given authority over the elements, and also the power to  bring down plagues (11:6).    -    These plagues hold many similarities to those mentioned in the   Hebrew Bible when Moses was attempting to liberate his people   (Exodus 7-12). Can it be said that these two witnesses are   attempting to do the same and to liberate those saints who have be   so harshly punished and harmed by this world and its injustices   (Revelation 6:10)?     
-    Additionally, they were garbed in sackcloth (11:3), which was   typically the garment used to bring about repentance, so this seems   to be representative of something. 
 
-   These witnesses are, unfortunately, killed by the beast mentioned  earlier (11:7).    
-   Their bodies are then left in the street of the great city that is  “prophetically [allegorically] called Sodom and Egypt, where also  their lord was crucified” (11:8 NRSV).    
-   They will then be resurrected after 3.5 days—note the similarities  to the aforementioned 3.5 years—before being called up to heaved  by a loud voice (11:11-12). 
-   A great earthquake ensues, and their enemies with a tenth of the  city fall (11:13).    
-   The moment we've all been waiting for has finally, finally arrived.  The seventh trumpet is here. We had to wade through chapters 10 and  most of 11 to get through this, but we've finally reached it. 
-   The seventh angel blows his trumpet, and loud voices from heaven  start saying something (11:15).    -    “The kingdom of the world has become the kingdom our of   Lord and of his Messiah [Christ]” (11:15 emphasis mine). The   sinful world will become the kingdom of God through reform. This is   what's being emphasized there.     
-    “We give you thanks, Lord God Almighty, who are and who were, for   you have taken your great power and begun to reign.” (11:17).   Again, the emphasis is on the Lord now taking power so that justice   can be done (11:18). 
 
-   God's temple suddenly opens, the ark of the covenant appears, which  is followed by lightning, noises, thunder, hail, and an earthquake  (11:19). This concludes the vision of the seven trumpets, and  introduces the vision found in chapter 12.    
 Chapter 12
-   Chapter 12 abruptly breaks with the  tone found in chapter 11, introducing a new vision with a different  purpose.    
-   This is the vision of the child  which is rich is symbolism drawn from familiar symbols to Jews and  Gentiles of that time. These are images they would have commonly  been exposed to because of surrounding countries such as Babylonia,  Egypt, Greece, or Rome, in addition to symbols present in the Hebrew  Bible. -    To give you an idea of a similar   story the early readers of this text would have been familiar with,   I give a paraphrased version of what my Bible says (New Oxford   Annotated Bible with Apocrypha 4th   Edition). This story starts with the goddess Leto who is pregnant   with Apollo. They are menaced by the dragon Python who pursues Leto   because he knows its prophesied that Apollo will be his death.     
 
-   “A great portent appeared in  heaven: a woman clothed with the sun, with the moon under her feet,  and on her head a crown of twelve stars.” (12:1). A portent is a  sign of warning that something great or huge is about to happen. So  in heaven, we find a sign of something great to come.    
-   “She was pregnant and was crying  out in birth pangs...” (12:2). This woman was, as stated, pregnant  and was in pain from the soon-coming birth.    
-   Then we get another portent that  appears “...a great red dragon, with seven heads and ten horns,  and seven diadems on his heads.” (12:3). A diadem is a crown, so  clearly this is some sort of political leader, or something that  views itself as exalted.    -    This dragon is probably the   Leviathan, the monster of Canaanite tradition, also found in Job 40   and Isaiah 27. This fearsome imagery would probably have been known   by even Jewish children. He is later called the Devil and Satan   (“the accuser”) in verse 9. 
-    The details of seven heads and ten   horns is probably drawn from the symbolism found in Daniel (Daniel   7). In the book of Daniel they were used to symbolize political   empires and rulers, though the symbolism isn't as clear here.     
 
-   The dragons tail is said to strike  down a third of the stars of heaven, throwing them to earth (12:4).    
-   The dragon stands before the woman,  ready to devour the child as soon as it was born (12:4). In spite of  this, the woman gives birth to her son who is “to rule [shepherd]  all the nations with a rod of iron.” (12:5).    
-   The child is saved from harm by  being “snatched away” and talked to God and to God's throne  (12:5). The woman feels into the wilderness to a safe place for 3.5  years (12:6). 
-   This protection is followed by a  war in heaven. Michael and his angles fight against this dragon and  his angels. The battle was fierce, but the dragon eventually loses.  The dragon is thrown down, and there is no longer a place in heaven  for them (12:7-9). 
-   This interruption to the story is  followed by a loud voice from heaven proclaiming “...Now have come  the salvation and the power and the kingdom of our God and the  authority of his Messiah [Christ]...” (12:10). 
-   Having seen that he was thrown down  to the earth, the dragon pursues the woman who had given birth to  the baby boy (12:13).    
-   The woman escapes, though, by being  given the wings of an eagle and flying off into the wilderness for  3.5 (a time, and times, and half a time) years (12:14). 
-   In an attempt to get the woman, the  serpent (previously called the dragon) pours out water like a river  to sweep her away with a flood (12:15). 
-   Thankfully, the earth opens up and  swallows the river the dragon had poured out from his mouth (12:16). -    This symbolism is probably an   allusion to Exodus 15. In that story, the earth swallows up the   pursuing Egyptian armies. Here, the same effect has been   accomplished in that those who are of God are protected from his   enemies. 
 
-   The dragon became angry because he  didn't seem to like this all too much. He decides that he is going  to make war “...on the rest of her children, those who keep the  commandments of God and hold the testimony of Jesus” (12:17). 
-   Chapter 12 flows right into chapter  13 without any break in narrative, so the last verse, verse 18,  starts as an introduction to chapter 13. “Then the dragon [Greek  Then he; other  ancient authorities read Then I stood]  took his stand on the sand of the seashore.” (12:18) 
Chapter 13
- As  we left off on Chapter 12, the dragon is standing on the edge of the  sea. John then sees “...a beast rising out of the sea, having ten  horns and seven heads; and on its horns were ten diadems, and on its  heads were blasphemous names.” (13:1) 
- The  beast is said to be like a leopard, a bear, and a lion (13:2). The  dragon gives it his power, throne, and authority (13:2).    
- One  of the beast's heads seems to have something strange about it,  though. “One of its heads seemed to have received a death-blow,  but its mortal wound [Greek the  plague of its death]  had been healed. In amazement the whole earth followed the beast.”  (13:3). They all worshiped the dragon and the beast (13:4). - This   could be an allusion to the assassination of Julius Caesar (44 BCE,   well before the writing of Revelation) or a reference to the   suicide of Nero. Many people believed that Nero would be brought   back to life and rule again after his death. This was incredibly   fearful because Nero was incredibly cruel, a terrible emperor, and   he commonly persecuted Christians. 
- Notice   that the mortal wound to one of the beast's heads does not bring   down the entire beast. The Roman Empire, despite the set backs it   experienced through its short-lived Emperors, didn't fall apart   upon their death. 
 
- The  beast was given a mouth and began to speak horrible words for  forty-two months or 3.5 years (13:5). It blasphemes, or talks bad  about, God and his dwelling (13:6). 
- This  beast was also given permission to make war on the saints and to  conquer them (13:7; some ancient manuscripts omit this sentence). It  was also given authority over every tribe and people and language  and nation (13:7).    - This,   to me, further strengthens the idea that the beast was the Roman   Empire since the Empire was truly expansive covering essentially   all of the known world, many tongues or languages, tribes, and   nations. 
 
- All  the people of the earth will worship it, all those who do not have  their name written in the book of life of the lamb (13:8). - It   was customary for people of that time to take on the religion of   their captors. The Roman Empire, being so extensive, placed its   religious beliefs on top of conquered nations. While the conquered   were allowed to preserve their own religious traditions, they also   had to practice or respect the Roman traditions. 
- It   appears that a name can be removed from this book (Revelation 3:5),   and that the judgment depends on the conduct of one during his life   (Revelation 20:12). 
 
- “Let  anyone who has an ear listen: If you are to be taken captive, into  captivity you go; if you kill with the sword, with the sword you  must be killed. Here is a call for the endurance and faith of the  saints.” (13:9-10) - In   spite of captivity and death, those saints and those who endure are   called to persevere, remain faithful, and to not fight back.   Violence is condemned here as whoever kills must also be killed.   Just as the lamb did not liberate or ransom the world through   violence (as the “expected” lion would have done), so are those   who remain to act the same in spite of their circumstances. 
 
- As  if the beast from the sea wasn't bad enough, an addition beast rises  from the earth. It has two horns like a lamb, but it speaks like the  dragon. (13:11) 
- It  acts on the behalf of the first beast, exercising all of its  authority, making the first beast with the mortal wound be worshiped  (13:12). 
- This  beast from the earth performs great signs. These signs resemble the  judgments poured out on the earth through the trumpets (8:7).    
- The  beast from the earth makes an image of the beast from the sea (the  one with the mortal wound), and causes people to worship this image.  Those who don't worship are killed (13:15).    
- Everyone,  regardless of socioeconomic status, is given a mark on their  forehead (13:16).    - This   is a sign of allegiance, and may act as a mockery the 144,000   sealed of God received on their forehead (7:3). Those without the   mark receive economic oppression (3:17). This may have been   important since unstable economies were discussed earlier (6:5-6). 
 
- “This  calls for wisdom: let anyone with understanding calculate the number  of the beast, for it is the number of  a person.  Its number is six hundred sixty-six [other ancient authorities read  six hundred  sixteen].”  (13:18 emphasis mine) - The   ancient practice of gematria used numbers to stand for a specific   letter. Though far from concrete, “Neron Caesar” ( Emperor Nero   in Hebrew letters) is 666. If you spelled this without the final   “n” you would get 616, as some of the older accounts state.