“Vengeance only destroys the one who seeks it. (Theo- Geary’s Grandfather/Acheron)”

From ‘’Justice’’ in Unspoken Sermons Series III (1889)
Context: If sin must be kept alive, then hell must be kept alive; but while I regard the smallest sin as infinitely loathsome, I do not believe that any being, never good enough to see the essential ugliness of sin, could sin so as to deserve such punishment. I am not now, however, dealing with the question of the duration of punishment, but with the idea of punishment itself; and would only say in passing, that the notion that a creature born imperfect, nay, born with impulses to evil not of his own generating, and which he could not help having, a creature to whom the true face of God was never presented, and by whom it never could have been seen, should be thus condemned, is as loathsome a lie against God as could find place in heart too undeveloped to understand what justice is, and too low to look up into the face of Jesus.

Source: The Wednesday Wars

Source: Dark Lover

Letter to James E. Yeatman of St. Louis, Vice-President of the Western Sanitary Commission (21 May 1865). As quoted on p. 358, and footnoted on p. 562, in Sherman: A Soldier's Passion For Order https://en.wikiquote.org/wiki/Special:BookSources/080938762X (2007), John F. Marszalek, Southern Illinois University Press, Chapter 15 ('Fame Tarnished')
Variant text: I confess, without shame, that I am sick and tired of fighting — its glory is all moonshine; even success the most brilliant is over dead and mangled bodies, with the anguish and lamentations of distant families, appealing to me for sons, husbands, and fathers […] it is only those who have never heard a shot, never heard the shriek and groans of the wounded and lacerated […] that cry aloud for more blood, more vengeance, more desolation. […] I declare before God, as a man and a soldier, I will not strike a foe who stands unarmed and submissive before me, but would rather say—‘Go, and sin no more.’
As quoted in Sherman: Merchant of Terror, Advocate of Peace https://en.wikiquote.org/wiki/Special:BookSources/1455611891 (1992), Charles Edmund Vetter, Pelican Publishing, p. 289
See the Discussion Page for more extensive sourcing information.
1860s, 1865, Letter to James E. Yeatman (May 1865)
Context: I confess without shame that I am tired & sick of war. Its glory is all moonshine. Even success, the most brilliant is over dead and mangled bodies […] It is only those who have not heard a shot, nor heard the shrills & groans of the wounded & lacerated (friend or foe) that cry aloud for more blood & more vengeance, more desolation & so help me God as a man & soldier I will not strike a foe who stands unarmed & submissive before me but will say ‘Go sin no more.

Majlisi, Bihārul Anwār, vol.44, p. 329
Regarding the Advent of Karbalā

"We Seek No Wider War" http://web.cecs.pdx.edu/~trent/ochs/lyrics/we-seek-no-wider-war.html (1965) from Farewells & Fantasies (1997)
The song title alludes to a speech by Lyndon Johnson (17 Februaty 1965), in which he said, referring to the war in Vietnam: "We have no ambition there for ourselves, we seek no wider war."
Lyrics

shelf-life.ew.com http://shelf-life.ew.com/2012/07/31/circle-of-friends-author-maeve-binchy-dies/

Source: The Palace of Illusions

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 293.