What is the meaning of Zechariah 4:6?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

So he said to me, “This is the word of the LORD to Zerubbabel: Not by might nor by power, but by My Spirit, says the LORD of Hosts.

Berean Standard Bible (BSB)

Then he answered and spoke to me, saying, “This is the word of Yahweh to Zerubbabel, saying, ‘Not by might, nor by power, but by my Spirit,’ says Yahweh of Armies.

World English Bible (WEB)

Then he answered{H6030}{(H8799)} and spake{H559}{(H8799)} unto me, saying{H559}{(H8800)}, This is the word{H1697} of the LORD{H3068} unto Zerubbabel{H2216}, saying{H559}{(H8800)}, Not by might{H2428}, nor by power{H3581}, but by my spirit{H7307}, saith{H559}{(H8804)} the LORD{H3068} of hosts{H6635}.

Strong's King James

Then he testified, and said to me, saying, "This is the word of יהוה Yahweh to Z’rubavel saying, 'Not by might, not by power, but by My רוּחַ Ruach-Spirit, says יהוה Yahweh-Tzva'ot.'"

The F.O.G*

The F.O.G Paraphrase

And he answereth and speaketh unto me, saying: ‘This is a word of Jehovah unto Zerubbabel, saying: Not by a force, nor by power, But—by My Spirit, said Jehovah of Hosts.

Young's Literal Translation