“Words had to change their ordinary meaning and to take that which was now given them. Reckless audacity came to be considered the courage of a loyal ally; prudent hesitation, specious cowardice; moderation was held to be a cloak for unmanliness; ability to see all sides of a question, inaptness to act on any. Frantic violence became the attribute of manliness; cautious plotting, a justifiable means of self-defence. The advocate of extreme measures was always trustworthy; his opponent a man to be suspected. To succeed in a plot was to have a shrewd head, to divine a plot a still shrewder; but to try to provide against having to do either was to break up your party and to be afraid of your adversaries.”
Book III, 3.82-[4]
History of the Peloponnesian War, Book III
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Thucydides 76
Greek historian and Athenian generalRelated quotes
“Audacity augments courage; hesitation, fear.”
Audendo virtus crescit, tardando timor.
Maxim 63
Variant translation: "Valour grows by daring, fear by holding back."
Sentences

1860s, First State of the Union address (1861)
Context: The war continues. In considering the policy to be adopted for suppressing the insurrection I have been anxious and careful that the inevitable conflict for this purpose shall not degenerate into a violent and remorseless revolutionary struggle. I have therefore in every case thought it proper to keep the integrity of the Union prominent as the primary object of the contest on our pan, leaving all questions which are not of vital military importance to the more deliberate action of the Legislature. In the exercise of my best discretion I have adhered to the blockade of the ports held by the insurgents, instead of putting in force by proclamation the law of Congress enacted. at the late session for closing those ports. So also, obeying the dictates of prudence, as well as the obligations of law, instead of transcending I have adhered to the act of Congress to confiscate property used for insurrectionary purposes. If a new law upon the same subject shall be proposed, its propriety will be duly considered. The Union must be preserved, and hence all indispensable means must be employed. We should not be in haste to determine that radical and extreme measures, which may reach the loyal as well as the disloyal, are indispensable.

Ha qualche volta un ortolan parlato
Cose molte a proposito a la gente;
E da un mantel rotto e sporco e stato
Molte volte coperto un uom prudente.
LVIII, 1
Rifacimento of Orlando Innamorato

Book Two, Part V “Tower-Eshkorek”, Chapter 4 (p. 305)
The Birthgrave (1975)

“Weakness always has a thousand means and cowardice is all that keeps us from listing them.”
Caliban in Une Tempête (1969)
Une Tempête (1969)

Speech on the October Crisis (October 1970), quoted in Louis, Fournier, F.L.Q: The Anatomy of an Underground movement (Toronto: NC Press Limited, 1984), p. 256
1970s

Refusing the Nobel Prize, New York Times (22 October 1964)