Coal lay in ledges under the ground since the Flood, until a laborer with pick and windlass brings it to the surface. We may well call it black diamonds. Every basket is power and civilization. For coal is a portable climate.
Commerce has set the mark of selfishness, the signet of its all-enslaving power, upon a shining ore, and called it gold: before whose image bow the vulgar great, the vainly rich, the miserable proud, the mob of peasants, nobles, priests, and kings, and with blind feelings reverence the power that grinds them to the dust of misery.
There is no power on earth which can be kept long confined within a narrow limit. It cannot be kept compressed too long to allow of expansion at a subsequent period.