"Pity, then, is related to benevolence, and malice to anger; and as benevolence has been already found to be connected with love, by a natural and original quality, and anger with hatred, it is by this chain the passions of pity and malice are connected with love and hatred."
— Hume, David (1711-1776)
(II.ii.9.3, p. 246)
David Hume, A Treatise of Human Nature. Being an Attempt to Introduce the Experimental Method of Reasoning into Moral Subjects. 3 vols. (London: Printed for John Noon, 1739; Thomas Longman, 1740). <Link to ESTC><Link to ECCO><Link to ECCO-TCP><Link to OLL>
Reading David Hume, A Treatise of Human Nature, eds. D. F. and M. J. Norton (Oxford: OUP, 2000). Searching in Past Masters and OLL editions.