“Self-discipline without talent can often achieve astounding results, whereas talent without self-discipline inevitably dooms itself to failure.”

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

Neither natural ability without instruction nor instruction without natural ability can make the perfect artist.
Morris Hicky Morgan translation
Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter I, Sec. 3; translation by Frank Granger

Source: The Carrie Diaries

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.

1961, Address before the American Society of Newspaper Editors
Context: If the self-discipline of the free cannot match the iron discipline of the mailed fist-in economic, political, scientific and all the other kinds of struggles as well as the military-then the peril to freedom will continue to rise.

Source: Atma Bodha (1987), p. 4: Quote nr. 2.

7th Public Discussion, Saanen, Switzerland (10 August 1971)
1970s