" The essential cultural discrimination is not between having and not having or haves and have-nots, but between the superfluous and the indispensable. Wisdom, it seems to me, is always poised upon the knowledge of minimums; it might be thought to be the art of minimums. Granting the frailty, and no doubt the impermanence, of modern technology as a human contrivance, the man who can keep a fire in a stove or on a hearth is not only more durable, but wiser, closer to the meaning of fire, than the man who can only work a thermostat. "