Source: Freedom, Loyalty, Dissent (1954), p. 147
“Similar though Marx and Thoreau may be in their accounts of the consequences of living in a society defined by money, their suggestions for how to respond to it are poles apart. Forget the Party. Forget the revolution. Forget the general strike. Forget the proletariat as an abstract class of human interest. Thoreau's revolution begins not with discovering comrades to be yoked together in solidarity but with the embrace of solitude. For Thoreau, Marx's first and fatal error was the creation of the aggregate identity of the proletariat. Error was substituted for error. The anonymity and futility of the worker were replaced by the anonymity and futility of the revolutionary. A revolution conducted by people who have only a group identity can only replace one monolith of power with another, one misery with another, perpetuating the cycle of domination and oppression. In solitude, the individual becomes most human, which is to say most spiritual.”
"The spirit of disobedience: an invitation to resistance"
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Curtis White 17
American academic 1951Related quotes

"Lessons of the Commune" http://www.marx.org/archive/lenin/works/1908/mar/23.htm, Collected Works, Vol. 13.
Collected Works

“Lessons of the Commune”, in Zagranichnaya Gazeta, No. 2 (23 March 1908) http://www.marx.org/archive/lenin/works/1908/mar/23.htm, as translated by Bernard Isaacs, Collected Works, Vol. 13, p. 478.
1900s
Variant: The proletariat should not ignore peaceful methods of struggle — they serve its ordinary, day-to-day interests, they are necessary in periods of preparation for revolution — but it must never forget that in certain conditions the class struggle assumes the form of armed conflict and civil war; there are times when the interests of the proletariat call for ruthless extermination of its enemies in open armed clashes. This was first demonstrated by the French proletariat in the Commune and brilliantly confirmed by the Russian proletariat in the December uprising.

Speech to the All-Russia Extraordinary Commission Staff (7 November 1918); Collected Works, Vol. 28, pp. 169-70 http://www.marxists.org/archive/lenin/works/1918/nov/07b.htm
1910s

As quoted in Cuba: A Dissenting Report (1960) by Samuel Shapiro, New Republic

Antithesis
The Note-Books of Samuel Butler (1912), Part IV - Memory and Design

“One forgets how human murderers are.”
A Murder is Announced (1950)

Quoted in "Sun Tzu for Women: The Art of War for Winning in Business" in page=113.