“The most dangerous flaws are those which are good in moderation," she said. "Evil is easy to fight. Lack of wisdom… that is very hard indeed.”
Source: The Titan's Curse
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Rick Riordan 1402
American writer 1964Related quotes

De Potentia (On Power) q. 3, art. 6, ad 4
Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 20

1960s
Source: Introduction to 1961 edition of Sceptical Essays (1961)
Context: The opinions that are held with passion are always those for which no good ground exists; indeed the passion is the measure of the holder’s lack of rational conviction. Opinions in politics and religion are almost always held passionately.

“When she was good,
She was very good indeed,
But when she was bad she was horrid.”
There Was a Little Girl http://rpo.library.utoronto.ca/poem/1345.html
Often misquoted as "When she was good/She was very, very good".
Context: There was a little girl,
Who had a little curl,
Right in the middle of her forehead.
When she was good,
She was very good indeed,
But when she was bad she was horrid.

other version: Hard training - easy combat; easy training - hard combat.
Philip Longworth: The Art of Victory, New York, 1965, cited in af.mil http://www.airpower.maxwell.af.mil/airchronicles/aureview/1986/nov-dec/menning.html.

“The most dangerous untruths are truths moderately distorted.”
H 7
Variant translation: The most dangerous untruths are truths slightly distorted.
Aphorisms (1765-1799), Notebook H (1784-1788)