“Mathematical physics is in the first place physics and it could not exist without experimental investigations.”

[‘A real free press for the first time in history’: Wikileaks editor speaks out in London, Journalism.co.uk, 2007-08-12, 2010-08-01, http://blogs.journalism.co.uk/editors/2010/07/12/a-real-free-press-for-the-first-time-in-history-wikileaks-editor-speaks-out-in-london/]

Notice sur les Titres et Travaux scientifiques de Pierre Duhem rédigée par lui-même lors de sa candidature à l'Académie des sciences (mai 1913), The Aim and Structure of Physical Theory (1906)

Richard Courant in: The Parsimonious Universe, Stefan Hildebrandt & Anthony Tromba, Springer-Verlag, 1996, page 148

Be Here Now (1971)
Context: I realized that although everything by which I knew myself, even my body and this life itself, was gone, still I was fully aware! Not only that, but this aware "I" was watching the entire drama, including the panic, with calm compassion.
Instantly, with this recognition, I felt a new kind of calmness — one of a profundity never experienced before. I had just found that "I", that scanning device — that point — that essence — that place beyond. A place where "I" existed independent of social and physical identity. That which was I was beyond Life and Death. And something else — that "I" Knew — it really Knew. It was wise, rather than just knowledgeable. It was a voice inside that spoke truth. I recognized it, was one with it, and felt as if my entire life of looking to the outside world for reassurance — David Reisman's other-directed being, was over.

Commentarius in VIII Libros Physicorum Aristoteles (c. 1230-1235)

Elements de la géométrie de l'infini (1727) as quoted by Amir R. Alexander, Geometrical Landscapes: The Voyages of Discovery and the Transformation of Mathematical Practice (2002) citing Michael S. Mahoney, "Infinitesimals and Transcendent Relations: The Mathematics of Motion in the Late Seventeenth Century" in Reappraisals of the Scientific Revolution, ed. David C. Lindberg, Robert S. Westman (1990)

Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, Vol. 123, No. 792 http://doi.org/10.1098/rspa.1929.0094 (6 April 1929)
Context: The underlying physical laws necessary for the mathematical theory of a large part of physics and the whole of chemistry are thus completely known, and the difficulty is only that the exact application of these laws leads to equations much too complicated to be soluble. It therefore becomes desirable that approximate practical methods of applying quantum mechanics should be developed, which can lead to an explanation of the main features of complex atomic systems without too much computation.

quoted in Lawrence M. Krauss, Fear of Physics: A Guide for the Perplexed (1993), p. 27

[Shewhart, Walter A., Deming, William E., Statistical Method from the Viewpoint of Quality Control, The Graduate School, The Department of Agriculture, 1939, 18]
Economic Control of Quality of Manufactured Product,1931