John Henry Newman, The idea of a university II.3 ("English Catholic literature").2.1; The idea of a university, ed. Frank M. Turner (New Haven: Yale University Press, 1996), 180-181.
I have been speaking of the scientific treatises or investigations of those who are not Catholics, . . . but I might even go on to speak of them in their persons as well as in their books. Were it not for the scandal which they would create; were it not for the example they would set; were it not for the certain tendency of the human mind involuntarily to outleap the strict boundaries of an abstract science, and to teach it upon extraneous principles, to embody it in concrete examples, and to carry it on to practical conclusions; above all, were it not for the indirect influence, and living energetic presence, and collateral duties, which accompany a Professor in a great school of learning, I do not see (abstracting from him, I repeat, in hypothesis, what never could possibly be abstracted from him in fact) why the chair of Astronomy in a Catholic University should not be filled by a La Place, or that of Physics by a Humboldt. Whatever they might wish to say, still, while they kept to their own science, they would be unable, like the heathen Prophet in Scripture, to 'go beyond the word of the Lord, to utter any thing of their own head'" (181, italics mine).