We think that diamonds are very important, gold is very important, all these minerals are very important. We call them precious minerals, but they are all forms of the soil. But that part of this mineral that is on top, like it is the skin of the earth, that is the most precious of the commons. – Wangari Maathai (1940–2011), Dirt! The Movie, 2009

Many things grow in the garden that were never sown there. – Thomas Fuller, Gnomologia, 1732