Every faculty in one man is the measure by which he judges of the like faculty in another.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

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Author Adam Smith
Source The Theory of Moral Sentiments
Topic
Date 1759
Language English
Reference
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Weblink https://en.wikisource.org/wiki/The_Theory_of_Moral_Sentiments

Context

“If, upon bringing the case home to our own breast, we find that the sentiments which it gives occasion to, coincide and tally with our own, we necessarily approve of them as proportioned and suitable to their objects; if otherwise, we necessarily disapprove of them, as extravagant and out of proportion. Every faculty in one man is the measure by which he judges of the like faculty in another. I judge of your sight by my sight, of your ear by my ear, of your reason by my reason, of your resentment by my resentment, of your love by my love. I neither have, nor can have, any other way of judging about them.” source