'Sciences are differentiated according to the various means through which knowledge is obtained. For the astronomer and the physicist both may prove the same conclusion: that the earth, for instance, is round: the astronomer by means of mathematics (i.e. abstracting from matter), but the physicist by means of matter itself.'
Thomas Aquinas the Summa Theologica | 'Question 1. The nature and extent of sacred doctrine' by Thomas Aquinas at 23 October, 1225-1275 A.D.