David Hartley, Observations on Man (6th edition…
“ Anger and cruelty are the opposites to mercy and compassion; the first, as a sudden start of passion, by which men wish and endeavour harm to others, and rejoice in it when done; which is revenge: the latter as a more settled habit of mind, disposing men to take a delight in inflicting misery and punishment, and in satiating their thirst after these, by beholding the tortures and anguish of the sufferers. ”
