Earlier, I made the comment about the seven stars in Jesus' right hand.
1:20 The mystery of the seven stars which thou sawest in my right hand, and the seven golden candlesticks. The seven stars are the seven angels of the seven churches: and the seven candlesticks which thou sawest are the seven churches.
Let's take this verse in. There are several references to "stars" being equated to angels in the Book of Revelation in addition to elsewhere in the Bible. David Jeremiah has an excellent commentary on angels if you're interested. Here's the link
We should also know from the Book of Matthew, chapter 25, or Acts 17:11 and other references (salt and light for one in Matthew 5:13:16). So the church is to be the light of the world, this we should know, but in practice this isn't always the case for Christ's unworthy bride. This is a sad reality elaborated in Revelation Chapter 2.
Unto the angel of the church of Ephesus write; These things saith he that holdeth the seven stars in his right hand, who walketh in the midst of the seven golden candlesticks; I know thy works, and thy labour, and thy patience and how canst not bear them which are evil; and thou hast tried them which say they are apostles, and are not, and hadst found them liars; And hadst borne, and hadst patience, and for my name's hast laboured, and hast not fainted. Nevertheless, I have somewhat against thee, because thou has left thy first love. Remember therefore from whence thou art fallen, and repent, and do the first works; or else I will come unto thee quickly, and will remove thy candlestick out of his place, except thou repent. But this thou hast, that thou hatest the deeds of the Nicolaitanes, which I also hate. He that have an ear, let him hear what the Spirit saith onto the churches; to him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God.
Jesus is addressing Ephesus, which is a church that follows through the motions and has adopted a very legalistic style. The problem is that they've forgotten about Jesus while going through the motions. One word here about the Nicolaitanes. These are people who wanted to centralize the authority in the church, replacing the Bible and Jesus with the hierarchy of men. This is why Christ despises them to this day.