Aquinas, Thomas, Summa Theologica, Part I, Q. 1, Art. 1, Reply 2, http://www.newadvent.org/summa/1001.htm#1, retrieved 3 September 2016, "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."
