“The opinion is widely prevalent that even if the subjects are totally forgotten, a valuable mental discipline is acquired by the efforts made to master them. While the Conference admits that, considered in itself this discipline has a certain value, it feels that such a discipline is greatly inferior to that which may be gained by a different class of exercises, and bears the same relation to a really improving discipline that lifting exercises in an ill-ventilated room bear to games in the open air. The movements of a race horse afford a better model of improving exercise than those of the ox in a tread-mill.”

Simon Newcomb, Henry Burchard Fine, Florian Cajori et al. Report of the Committee [of Ten http://books.google.com/books?id=58agAAAAMAAJ on Secondary School Studies Appointed at the Meeting of the National Educational Association July 9, 1892: With the Reports of the Conferences Arranged by this Committee and Held December 28-30, 1892]. p. 108

Good people have become a defeated class in Blair's Britain, argues Theodore Dalrymple http://www.socialaffairsunit.org.uk/blog/archives/001464.php (March 29, 2007).
The Social Affairs Unit (2006 - 2008)

Introduction to the Bhagavad-Gita (1944)
Context: Human beings are not born identical. There are many different temperaments and constitutions; and within each psycho-physical class one can find people at very different stages of spiritual development. Forms of worship and spiritual discipline which may be valuable for one individual maybe useless or even positively harmful for another belonging to a different class and standing, within that class, at a lower or higher level of development.

The Death Wish of the Anarcho-Communists (1970) http://www.lewrockwell.com/rothbard/rothbard122.html.

Organizational Questions of the Russian Social Democracy http://www.marxists.org/archive/luxemburg/1904/questions-rsd/ch01.htm (1904)
Context: The self-discipline of the Social Democracy is not merely the replacement of the authority of bourgeois rulers with the authority of a socialist central committee. The working class will acquire the sense of the new discipline, the freely assumed self-discipline of the Social Democracy, not as a result of the discipline imposed on it by the capitalist state, but by extirpating, to the last root, its old habits of obedience and servility.

Cap 3 "Under the Japanese Heel"

Witold Doroszewski, Elements of lexicology and semiotics. Vol. 46. Mouton, 1973. p. 36-37

Source: Demon Princes (1964-1981), The Book of Dreams (1981), Chapter 14 (p. 347)

On his military leadership against fascist troops in Spain, as quoted in "Durruti Is Dead, Yet Living" (1936) http://sunsite.berkeley.edu/Goldman/Writings/Essays/durruti.html, by Emma Goldman
Context: I have been an Anarchist all my life. I hope I have remained one. I should consider it very sad indeed, had I to turn into a general and rule the men with a military rod. They have come to me voluntarily, they are ready to stake their lives in our antifascist fight. I believe, as I always have, in freedom. The freedom which rests on the sense of responsibility. I consider discipline indispensable, but it must be inner discipline, motivated by a common purpose and a strong feeling of comradeship.