"Science has no authority. It is not the magical product of the given, the data, the observations. It is not a gospel of truth. It is the result of our own endeavours and mistakes. It is you and I who make science, as well as we can. It is you and I who are responsible for it (p. 259)."
Popper, Karl, 2000 [first publish 1983], Realism and the Aim of Science: From the Postscript to The Logic of Scientific Discovery, Edited by W.W. Bartley III, Routledge, ISBN 0415084008.