"True conformity to the dictates of nature requires reverence for the past and solicitude for the future. 'Nature' is not simply the sensation of the passing moment; it is eternal, though we evanescent men experience only a fragment of it. We have no right to imperil the happiness of posterity by impudently tinkering with the heritage of humanity."

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I rejoice that horses and steers have to be broken before they can be made the slaves of men, and that men themselves have some wild oats still left to sow before they become submissive members of society. Undoubtedly, all men are not equally fit subjects for civilization; and because the majority, like dogs and sheep, are tame by inherited disposition, this is no reason why the others should have their natures broken that they may be reduced to the same level.

— Henry David Thoreau