“A woman's mind is her most precious weapon. It must not be employed clumsily or prematurely. Much like the aforementioned knife in the back, a clever gibe is most effective when it is unanticipated.”
Source: The Way of Kings
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Brandon Sanderson 313
American fantasy writer 1975Related quotes

“Virtue is like precious odors — most fragrant when they are incensed or crushed.”
Of Adversity
Essays (1625)

“Books and ideas are the most effective weapons against intolerance and ignorance.”

Source: Are We Victims of Propaganda, Our Invisible Masters: A Debate with Edward Bernays (1929), p. 144

http://www.jstor.org/discover/10.2307/2495035?uid=3738776&uid=2&uid=4&sid=21104844992271
A more accurate translation, with respect to the context, might read: "Cadres are the key to everything"
In Russian: [...] из всех ценных капиталов, имеющихся в мире, самым ценным и самым решающим капиталом являются люди [...]. Кадры решают все!
Address to the Graduates from the Red Army Academies http://marx2mao.com/Stalin/GRA35.html. (4 May 1935); Variant translation: Human resources solve all!
Stalin's speeches, writings and authorised interviews

“The most potent weapon in the hands of the oppressor is the mind of the oppressed.”
White Racism and Black Consciousness
I Write What I Like (1978)
Variant: The greatest weapon in the hand of the oppressor is the mind of the oppressed.

John Hale
Source: The Crucible (1953)
Context: It is mistaken law that leads you to sacrifice. Life, woman, life is God's most precious gift; no principle, however glorious, may justify the taking of it. I beg you, woman, prevail upon your husband to confess. Let him give his lie. Quail not before God's judgment in this, for it may well be God damns a liar less than he that throws his life away for pride.