“Fear is an insidious and deadly thing. It can warp judgment, freeze reflexes, breed mistakes. Worse, it's contagious.”

Attributed

Book XXIV, line 494, p. 336
The Iliads of Homer, Prince of Poets (1611)

Source: Betrayed

"Zeitgeist and Poltergeist; or, Are Movies Going to Pieces?" http://www.paulrossen.com/paulinekael/aremoviespieces.html (December 1964), from I Lost It at the Movies (1965).

From Reason and Affection. First published in Paradyse of Dainty Devices (1576), revised in the 1596 edition. It is also known as "Being in Love he complaineth". Published by Grosart in Miscellanies of the Fuller Worthies' Library, Vol. IV (1872)
Poems

Conditions of Progress in Democratic Government (1909).
Context: No greater mistake can be made than to think that our institutions are fixed or may not be changed for the worse. … Increasing prosperity tends to breed indifference and to corrupt moral soundness. Glaring inequalities in condition create discontent and strain the democratic relation. The vicious are the willing, and the ignorant are unconscious instruments of political artifice. Selfishness and demagoguery take advantage of liberty. The selfish hand constantly seeks to control government, and every increase of governmental power, even to meet just needs, furnishes opportunity for abuse and stimulates the effort to bend it to improper uses... The peril of this Nation is not in any foreign foe! We, the people, are its power, its peril, and its hope!

Source: This Book Will Save Your Life (2006), P. 311.

C'est pire qu'un crime, c'est une faute.
Reaction to the 1804 drumhead trial and execution of Louis Antoine de Bourbon, Duke of Enghien, on orders of Napoleon. Actually said by either Antoine Boulay de la Meurthe, legislative deputy from Meurthe (according to the Oxford Dictionary of Quotations) or Joseph Fouché, Napoleon's chief of police (according to John Bartlett, Familiar Quotations, 10th ed. (1919), http://www.bartleby.com/100/758.1.html).
Misattributed

Source: You Can't Go Home Again