When I communicate my thought and my sentiments to a friend with whom I am in full sympathy, so that my feelings pass into him and I am conscious of what he feels, do I not live in his brain as well as in my own-most literally!

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Citation

Peirce, Charles Sanders. Collected Papers of Charles Sanders Peirce: Science and Philosophy. Vol. 7, The Belknap Press, 1966, par. 591.