"There is not a tool, an implement, or a machine that has not resulted in a decrease in the contribution of human labor. Labor is not made permanently idle [though]; when replaced in one special category... it turns its attack against other obstacles on the main road to progress."

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The kitchen clock is more convenient than sidereal time. We must use the popular category, as we do by the Linnæan classification, for convenience, and not as exact and final. Otherwise, we are presently confounded, when the best-settled traits of one race are claimed by some new ethnologist as precisely characteristic of the rival tribe.

— Ralph Waldo Emerson