Gail

“had gradually come to have a realizing sense of the fact that Slade was a man whose heart and hands and soul were steeped in the blood of offenders against his dignity; a man who awfully avenged all injuries, affront, insults or slights, of whatever kind—on the spot if he could, years afterward if lack of earlier opportunity compelled it; a man whose hate tortured him day and night till vengeance appeased it—and not an ordinary vengeance either, but his enemy’s absolute death—nothing less; a man whose face would light up with a terrible joy when he surprised a foe and had him at a disadvantage. A high and efficient servant of the Overland, an outlaw among”
― Mark Twain, Roughing It : Premium Edition -Illustrated