Richard Ritenbaugh explains the symbolism of the seven golden lamps (Zechariah 4:2; Revelation 1:20) as seven churches empowered by an abundance of oil (a symbol of God's Spirit, Zechariah 4:6), manifested as works or fruit. Zerubbabel, finishing the physical Temple, serves as a type of Christ, who finishes the spiritual one. The seven stars, lamps, and eyes appear to be interchangeable, representing the churches, the messengers of the churches, or the spirit of the churches (Revelation 1:16, 20; 5:6).
Richard Ritenbaugh insists that the Bible, in both parables and prophecies, interprets itself and remains consistent in its use of symbols. We cannot arbitrarily pull symbols out of the air and attach meaning. The first four parables of Matthew 13 (Sower, Wheat and Tares, Mustard Seed, and Leaven) all describe Satan's plan to destroy the church: (1) attacking at early stages of growth, (2) infiltrating through secret agents, (3) influencing unchecked, unnatural growth going beyond God's ordained limits, inviting worldly and demonic influence, and (4) influencing yielding to sin and false doctrine.
A summary of the reasons God uses symbols in the Bible, along with a few rules for understanding them.