Harriet Beecher Stowe,
A Key to Uncle Tom's Cabin
(1853)
“ But even killing, with intention to kill, is not always murder; there may be justifiable and excusable homicide, and killing in sudden heat and passion is so modified to manslaughter. Yet there may be murder when there is no ill-feeling,—nay, perfect indifference to the slain,—as in the case of the robber who slays to conceal his crime. Malice aforethought is that depraved feeling of the heart, which makes one regardless of social duty, and fatally bent on mischief. ”
