“Useful quantification is so often the key to fruitful science.”

As quoted in Building Fluency Through Practice and Performance (2008) by Timothy Rasinski and Lorraine Griffith, p. 64, but in fact a quotation by Roger Bacon: Et harum scientiarum porta et clavis est Mathematica, "And of these sciences the door and key is mathematics", from Bacon's Opus Majus (1267) https://books.google.co.uk/books?id=UfqcGd8NOFsC&pg=PA97&lpg=PA97&dq=%22porta+et+clavis%22+opus+majus&source=bl&ots=nGgt2Lhxqe&sig=88kIPB5EAKAKtm0APk6J5OrS1D0&hl=en&sa=X&ved=0ahUKEwiU36D2gIbLAhVBWBQKHSW9CKgQ6AEINDAE#v=onepage&q=%22porta%20et%20clavis%22%20opus%20majus&f=false.
Attributed

Don Quixote in England (1731), Act I, scene vi http://books.google.com/books?id=8_VbAAAAQAAJ&q=%22Money+is+the+fruit+of+evil+as+often+as+the+root+of+it%22&pg=PA13#v=onepage

In personal correspondence, quoted in Elisabeth Nemeth's chapter "Logical Empiricism and the History and Sociology of Science" in the Cambridge Companion to Logical Empiricism (2007) edited by Alan W. Richardson and Thomas Uebel.

Source: Dean of the Plasma Dissidents (1988), p. 196.
Context: Since religion intrinsically rejects empirical methods, there should never be any attempt to reconcile scientific theories with religion. An infinitely old universe, always evolving, may not be compatible with the Book of Genesis. However, religions such as Buddhism get along without having any explicit creation mythology and are in no way contradicted by a universe without a beginning or end. Creatio ex nihilo, even as religious doctrine, only dates to around AD 200. The key is not to confuse myth and empirical results, or religion and science.

How to Understand Politics: What the Humanities Can Say to Science (2007)

Preface.
A History of Science Vol.2 Hellenistic Science and Culture in the Last Three Centuries B.C. (1959)

Revue Scientifique (1871)
Variant translation: There are no such things as applied sciences, only applications of science.

Dissent, Burnet v. Coronado Oil & Gas Co., 285 U.S. 393 (1932).
Judicial opinions
Context: Stare decisis is usually the wise policy, because in most matters it is more important that the applicable rule of law be settled than that it be settled right... This is commonly true even where the error is a matter of serious concern, provided correction can be had by legislation. But in cases involving the Federal Constitution, where correction through legislative action is practically impossible, this court has often overruled its earlier decisions. The court bows to the lessons of experience and the force of better reasoning, recognizing that the process of trial and error, so fruitful in the physical sciences, is appropriate also in the judicial function.