“Confronted with such a variety most philosophers try to establish one approach to the exclusion of all others. As far as they are concerned there can only be one true way- and they want to find it. Thus normative philosophers argue that knowledge is a result of the application of certain rules, they propose rules which in their opinion constitute knowledge and reject what clashes with them.”
Pg 84.
Conquest of Abundance (2001 [posthumous])
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Paul Karl Feyerabend 81
Austrian-born philosopher of science 1924–1994Related quotes

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Source: 1930s-1951, The Blue Book (c. 1931–1935; published 1965), p. 19

Source: The Sociology of Knowledge, (1937), p. 503

“Knowledge can only be got in one way, the way of experience; there is no other way to know.”
Pearls of Wisdom

“For there is but one essential justice which cements society, and one law which establishes this justice. This law is right reason, which is the true rule of all commandments and prohibitions.”
Est enim unum ius quo deuincta est hominum societas et quod lex constituit una, quae lex est recta ratio imperandi atque prohibendi. Quam qui ignorat, is est iniustus, siue est illa scripta uspiam siue nusquam.
Book I, section 42; Translation by C.D. Yonge)
De Legibus (On the Laws)
Context: For there is but one essential justice which cements society, and one law which establishes this justice. This law is right reason, which is the true rule of all commandments and prohibitions. Whoever neglects this law, whether written or unwritten, is necessarily unjust and wicked.

" The Influence Of Women On The Progress Of Knowledge http://www.public.coe.edu/~theller/soj/u-rel/buckle.html". Lecture given at the Royal Institution 19 March 1858. In: The Miscellaneous and Posthumous Works of Henry Thomas Buckle (1872)