“Tis evident, that sympathy, or the communication of passions, takes place among animals, no less than among men. Fear, anger, courage and other affections are frequently communicated from one animal to another […] And 'tis remarkable, that tho' almost all animals use in play the same member, and nearly the same action as in fighting; a lion, a tyger, a cat their paws; an ox his homs; a dog his teeth; a horse his heels: Yet they most carefully avoid harming their companion, even tho' they have nothing to fear from his resentment; which is an evident proof of the sense brutes have of each other's pain and pleasure.”
Part 2, Section 12
A Treatise of Human Nature (1739-40), Book 2: Of the passions
Help us to complete the source, original and additional information
David Hume 138
Scottish philosopher, economist, and historian 1711–1776Related quotes

Seven Experiments That Could Change the World (London: Fourth Estate, 1994), p. 24.

“5003. Tho' all Men were made of one Metal, yet they were not cast all in the same Mould.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)