"As we have no immediate experience of what other men feel, we can form no idea of the manner in which they are affected, but by conceiving what we ourselves should feel in the like situation. Though our brother is upon the rack, as long as we are at our safe, our senses will never inform us of what he suffers. They never did and never can carry us beyond our own persons, and it is by the imagination only that we can form any conception of what are his sensations."
-Adam Smith, The Theory of Moral Sentiments
