"The earth, he'd say, is just a big machine. A big processing plant. A factory. That's your big answer. The big truth. Think of a rock polisher, one of those drums, goes round and round, rolls twenty-four/seven, full of water and rocks and gravel. Grinding it all up. Round and round. Polishing those ugly rocks into gemstones."
January 1, 1970
https://en.wikiquote.org/wiki/Gemstone