The Basis of Morality by Part 3 Chapter 8 Page 22

him listen to my advice. When he is inflamed with rage, and meditates doing some one a grievous injury, he should bring the thing vividly before his mind, as a fait accompli; he should clearly picture to himself this other fellow-being tormented with mental or bodily pain, or struggling with need and misery; so that he is forced to exclaim: “This is my work!” Such thoughts as these, if anything, will avail to moderate his wrath.

For Compassion is the true antidote of anger; and by practising on oneself this artifice of the imagination, one awakes beforehand, while there is yet time,

la piti�, dont la voix,

Alors qu'on est veng�, fait entendre ses lois.

— (Voltaire, S�miramis, V. 6.)