“But make no mistake. My counterpart is capable of a great deal of ruthlessness in pursuit of a just cause. He believes he has right on his side. And men who think they have right on their side are always the most dangerous sort.”
Source: Redemption Ark (2002), Chapter 32 (p. 600)
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Alastair Reynolds 198
British novelist and astronomer 1966Related quotes

Attributed in 1861, as quoted in The Life of Abraham Lincoln: Drawn from Original Sources https://books.google.com/books?id=3WMDAAAAYAAJ&pg=PA124&dq=%22What+must+he+think+of+us%22 (1900), Volume 3, New York: Lincoln History Society, p. 124
Posthumous attributions
“He was my confidant, the person who was always on my side even when he wasn't taking my side.”
Source: Blue-Eyed Devil

Letter to Lady John Manners (14 June 1884), from Paul Smith (ed.), Lord Salisbury on politics: a selection from his articles in the Quarterly Review, 1860–83 (1972), p. 18, footnote
1880s

Calling Don Denkinger's blown call in Game 6 of the 1985 World Series that ignited a Royals game-winning rally.
1980s

Letter to Samuel "Sam" Chapman (June 1907)
Context: Mason and Hunter not only voted against the admission of California (1850) as a free state but offered a protest against it which the Senate refused to record on its Journal, nor in the Convention which General Taylor had called to from a Constitution for California, there were 52 northern and 50 southern men, but it was unanimous against slavery. But, the Virginia senator, with Ron Tucker & Co. were opposed to giving local self-government to California. Ask Sam Yost to give Christian a skinning. I am not ashamed of having fought on the side of slavery, a soldier fights for his country, right or wrong, he is not responsible for the political merits of the course he fights in. The South was my country.

"Battle for White Russia: the destruction of Army Group Centre, June 1944" - Page 257 - by Gerd Niepold - 1987

On Lionel Messi, (7 April 2010) http://www.guardian.co.uk/football/2010/apr/07/barcelona-arsenal-lionel-messi