I saw seven golden candlesticks, which, by the last verse of this chapter, represented the seven Churches of Asia. We may suppose these candlesticks to have been shown to St. John, like what is described, Exodus xxv. 31. For in these visions of St. John are frequent allusions to the former tabernacle, and to things relating to the service and worship of God, which Moses was ordered to make. (Witham)
The seven candlesticks are the seven churches that he was commanded to write. He called them candlesticks as they produce the enlightening of the glory of Christ. He did not call them candles, but candlesticks. The candlesticks cannot not be enlightened all by themselves, for it possess what it needs to be able to enlighten. Christ enlightens His churches spiritually. Just as the holy apostle counsels those who have received the faith, “shine as lights in the world, holding forth the word of life.(Phil. 2:15-15)” Indeed, the star does not have light on its own but is able to get light from something else, just like the evangelist saw the churches as candlesticks and not just candles. For it says about Christ, “For it is you who gives light marvelously from everlasting mountains.(Ps. 75:3)”
He says that He was like Him after His victory over death, when He had ascended into the heavens, after the union in His body of the power which He received from the Father with the spirit of His glory.