Under the Mountain Dark and Tall Track

Erebor and also Tao Te Ching chapter 5:

Heaven and earth are ruthless
They see the ten thousand things as dummies
The wise are ruthless
They see the people as dummies

The space between heaven and earth is like a bellows
The shape changes but not the form
The more it moves the more it yields
More words count less
Hold fast to the center

https://www.wussu.com/laotzu/laotzu05.html

Image by Doug Knuth; available under a CC BY-SA 2.0 license at https://www.flickr.com/photos/94535251@N00/11498474746