What does the quote go tell it on mountains mean?

The phrase "go tell it on the mountains" is actually part of a Christmas carol called "Go Tell It on the Mountain". It's not a stand-alone quote with a specific meaning outside the context of the song.

Here's what the phrase signifies within the carol:

* Proclaiming the good news: The carol is about the birth of Jesus Christ and the message of hope and salvation that he brought. "Go tell it on the mountain" means to spread this message widely, to proclaim it to everyone, even on high places like mountains.

* Sharing the joy: The phrase emphasizes the joyful nature of the message and the desire to share it with the whole world.

So, the meaning of "go tell it on the mountain" in this context is to spread the message of Christ's birth far and wide, sharing the joy and hope it brings.