Revelation 1: 17-18

^{17 "}When I saw him, I fell at his feet as though dead. Then he placed his right hand on me and said: “Do not be afraid. I am the First and the Last. ¹⁸ I am the Living One; I was dead, and now look, I am alive for ever and ever! And I hold the keys of death and Hades." 

One can only imagine the feeling John must have had at this point being confronted with all this overwhelming sound and imagery, but Christ is quick to comfort him and tell him not to be afraid.

Revelation 1:19-20

¹⁹ “Write, therefore, what you have seen, what is now and what will take place later. ²⁰ The mystery of the seven stars that you saw in my right hand and of the seven golden lampstands is this: The seven stars are the angels of the seven churches, and the seven lampstands are the seven churches."

In these verses Jesus makes it clear what the seven lampstands and the seven angels were referring to earlier. One source I found suggested that the word angel could also be translated as messenger, so that the verse may reference human pastors or disciples. 

Revelation 2: 1-6

“To the angel of the church in Ephesus, write:

These are the words of him who holds the seven stars in his right hand and walks among the seven golden lampstands. ² I know your deeds, your hard work and your perseverance. I know that you cannot tolerate wicked people, that you have tested those who claim to be apostles but are not, and have found them false. ³ You have persevered and have endured hardships for my name, and have not grown weary.

⁴ Yet I hold this against you: You have forsaken the love you had at first. ⁵ Consider how far you have fallen! Repent and do the things you did at first. If you do not repent, I will come to you and remove your lampstand from its place. ⁶ But you have this in your favor: You hate the practices of the Nicolaitans, which I also hate."