David Hume,
Treatise of Human Nature/Book 3…
(1739)
“ But they are the more engaging, the more minute the concern is, and are a proof of the highest merit in any one, who is capable of them. The passions are so contagious, that they pass with the greatest facility from one person to another, and produce correspondent movements in all human breasts. Where friendship appears in very signal instances, my heart catches the same passion, and is warm'd by those warm sentiments, that display themselves before me. ”
