 This later Feyerabend declared that his primary aim was humanitarian, not epistemological, so it was not his purpose to defend the rationality of science. His attack on dogmatic, scientistic conservatism, both within and without scientific communities, has methodological import, albeit negative import. Feyerabend was one of the first to stress the strong historical contingency of scientific work, in context of justification as well as discovery, and he defended this contingency at the methodological level as well. Thus there is no fixed rationality of science. For example, Galileo (he argued in historical detail) introduced a new sort of methodology, a new kind of rationality, partly via rhetorical deception, partly with arresting applications of mathematics to basic mechanical phenomena. Galileo’s new vision happened to win out, but there is no point in calling it either rational or irrational in any absolute sense.