"To understand events as experienced by actual men and institutions we must be concerned with the history of errors and false starts as well as successes-although we make this distinction on the basis of what we now know of the tradition of success. As we go back in time the uncertainty of the outlook and of the objectives of scientific inquiries increases. The essence of the scientific movement is research. The answers to the essential question, what to do in scientific research-what questions to put to nature, by what methods to get answers, what to count as satisfactory answers-became clear only by the accumulation of successes and the marking of failures."

“The strategic act by which Grosseteste and his thirteenth- and fourteenth-century successors created modern experimental science was to unite the experimental habit of the practical arts with the rationalism of twelfth-century philosophy.”

“Newton achieved the clearest appreciation of the relation between the empirical elements in a scientific system and the hypothetical elements derived from a philosophy of nature.”

“By this lux as the first corporeal form Grosseteste did not, of course, mean simply visible light. As an emanation or propagation of substance and power lux was the basis of all bodily magnitude and of all natural operations, of which the manifestation of visible light was only one. One of the most important functions of lux was to be the intermediary between spirit and matter. It was the instrument by which God produced the macrocosm of the universe, and the instrument by which the soul made contact with the physical body and the things of sense in the microcosm of man.”

“In its application to natural science Grosseteste based his method of verification and falsification on two assumptions about the nature of reality. The first was the principle of the uniformity of nature, meaning that forms are always uniform in their operations. ...In support of this principle he quoted 'Aristotles II de Generat.: ...'the same cause, provided it remains in the same condition, cannot produce anything but the same effect.' The second assumption Grosseteste made was that of the principle of economy, or lex parsimoniae. This he also derived from Aristotle, who stated it as a pragmatic principle.”

“Nicolaus Copernicus is the supreme example of a man who revolutionized science by looking at the old facts in a new way.”

“Grosseteste's contribution was to emphasize the importance of falsification in the search for true causes and to develop the method of verification and falsification into a systematic method of experimental procedure.”