Zechariah 4

In this fifth vision, Zechariah sees a gold lampstand w/two olive trees.  As the vision unfolds, God gives the message to Zerubbabel which is one of the key verses of this book:  "‘Not by might nor by power, but by my Spirit,’ says the Lord Almighty." (4:6b)   This is an encouragement to Zerubbabel who led Israel to start the rebuilding of the Temple, to know that he will be able to complete it by the power of the Holy Spirit, not relying on human might (of many, like an army) or power (of an individual, like a leader).   So, in the context, the two olive branches would represent Zerubbabel, the civil leader, and Joshua, the religious leader; and they are branches of two olive trees which would then likely represent civil and religious leadership of God's People.  The oil being supplied to light the lampstand with the 7 lamps of 7 channels is a picture of the Holy Spirit supplying for this abundance of light (since 7 is the number of perfection, and seven 7s would be abundance).

The immediate fulfillment of this vision occurs just 3 years later when the temple is completed.  But, the long-term fulfillment would be when the Messiah returns and reestablishes His throne in the Temple; and the two branches could refer to the two witnesses who precede His Return, in keeping with the theme of the light (and the wording used in Revelation and Zechariah are very similar).

This passage is an encouragement to me, to know that the Spirit will enable me to complete what He has anointed (with "oil") or called me to do, despite any mountains that I may face, knowing they will be "leveled".