“The State is competent to assign duties and draw the line between good and evil only in its immediate sphere. Beyond the limits of things necessary for its well-being, it can only give indirect help to fight the battle of life by promoting the influences which prevail against temptation, — religion, education, and the distribution of wealth.”
p, 125
The History of Freedom in Antiquity (1877)
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John Dalberg-Acton, 1st Baron Acton 112
British politician and historian 1834–1902Related quotes

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infinity plus interview (2001)
Variant: In real life, the hardest aspect of the battle between good and evil is determining which is which.
Context: The battle between good and evil is a legitimate theme for a Fantasy (or for any work of fiction, for that matter), but in real life that battle is fought chiefly in the individual human heart. Too many contemporary Fantasies take the easy way out by externalizing the struggle, so the heroic protagonists need only smite the evil minions of the dark power to win the day. And you can tell the evil minions, because they're inevitably ugly and they all wear black.
I wanted to stand much of that on its head.
In real life, the hardest aspect of the battle between good and evil is determining which is which.

“We draw the line against misconduct, not against wealth.”
State of the Union address (2 December 1902)
1900s
Context: Our aim is not to do away with corporations; on the contrary, these big aggregations are an inevitable development of modern industrialism, and the effort to destroy them would be futile unless accomplished in ways that would work the utmost mischief to the entire body politic. We can do nothing of good in the way of regulating and supervising these corporations until we fix clearly in our minds that we are not attacking the corporations, but endeavoring to do away with any evil in them. We are not hostile to them; we are merely determined that they shall be so handled as to subserve the public good. We draw the line against misconduct, not against wealth.

"Notes on the Way", Time and Tide Magazine (10 June 1934); reprinted in The Prince's Tale and Other Uncollected Writings (1998)
Source: Quote, The Concept of Strategy, 1971, p. vii

For My Legionaries: The Iron Guard (1936), Politics