"By pretending that convention is Nature, that disobeying a personal prohibition is a medical illness, they establish themselves as agents of social control and at the same time disguise their punitive interventions in the semantic and social trappings of medical practice."

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The facts of nature are what they are, but we can only view them through the spectacles of our mind. Our mind works largely by metaphor and comparison, not always (or often) by relentless logic. When we are caught in conceptual traps, the best exit is often a change in metaphor not because the new guideline will be truer to nature (for neither the old nor the new metaphor lies "out there" in the woods), but because we need a shift to more fruitful perspectives, and metaphor is often the best agent of conceptual transition.

— Stephen Jay Gould