“One can show the following: given any rule, however "fundamental" or "necessary" for science, there are always circumstances when it is advisable not only to ignore the rule, but to adopt its opposite.”
Pg. 23.
Against Method (1975)
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Paul Karl Feyerabend 81
Austrian-born philosopher of science 1924–1994Related quotes

Encyclical Fides et Ratio, 14 September 1998
Source: www.vatican.va http://www.vatican.va/holy_father/john_paul_ii/encyclicals/documents/hf_jp-ii_enc_14091998_fides-et-ratio_en.html
The Left and Rights (Routledge: 1983), p. 18 http://books.google.com/books?id=9kPnuG9ufDgC&pg=RA1-PT18

Source: Rules of Sociological Method, 1895, p. 64

“I never was truly my own master but was always ruled by circumstances.”
Conversation with Emmanuel, comte de Las Cases (11 November 1816), Mémorial de Sainte Hélène, v. 4, p. 133 http://books.google.com/books?id=945jAAAAMAAJ&pg=PA133.
Context: I may have had many projects, but I never was free to carry out any of them. It did me little good to be holding the helm; no matter how strong my hands, the sudden and numerous waves were stronger still, and I was wise enough to yield to them rather than resist them obstinately and make the ship founder. Thus I never was truly my own master but was always ruled by circumstances.

The Art of Persuasion
Mittel Energie auszuüben und nur ihn anzuordnen der Energie besitzt kann sie ausüben. Dieser direkte Anschluß der Energie und der Richtlinie bildet die grundlegende Wahrheit aller Politik und den Schlüssel zu aller Geschichte.
As quoted in The German Idea of Freedom : History of a Political Tradition (1972) by Leonard Krieger, p. 354