"It is not sufficient to read Galileo with the eyes of the twentieth century... we can only understand his work if we …"

"Little progress can be made if we think of the older... as merely a case of bad science or... imagine that only the a…"

"[T]ake note of those cases in which men not only solved a problem but had to alter their mentality in the process, or…"

"It has proved almost more useful to learn something of the misfires and the mistaken hypotheses of early scientists..…"

"[I]n... celestial and terrestrial physics... change is brought about... by transpositions... inside the minds of the …"

"Even the greatest geniuses who broke through the ancient views in some special field... would remain stranded in... m…"

"It required... combined efforts to clear up... simple things which we now regard as obvious..."

"Perhaps the lack of mathematics, or... mathematical ways of formulating... was partly responsible for... verbal subtl…"

"[T]he peculiar character of that Aristotelian universe... things... in motion had to be accompanied by a mover all of…"

"[F]ourteenth-century writers, first... a group at , and after these, , Albert of Saxony and Nicholas of Oresme... [we…"