All things are flowing, even those that seem immovable. The adamant is always passing into smoke. The plants imbibe the materialswhich they want from the air and the ground. They burn, that is, exhale and decompose their own bodies into the air and earth again. The animal burns, or undergoes the like perpetual consumption. The earth burns, the mountains burn and decompose, slower, but incessantly.

Society and Solitude and Other Essays (ed. 1871)