Nor is there surely any thing derogatory to the position of a Catholic in such a proceeding. The Church has ever appealed and deferred to witnesses and authorities external to herself, in those matters in which she thought they had means of forming a judgment: and that on the principle, _Cuique in arte sua credendum_. She has even used unbelievers and pagans in evidence of her truth, as far as their testimony went. She avails herself of scholars, critics, and antiquarians, who are not of her communion. She has worded her theological teaching in the phraseology of Aristotle; Aquila, Symmachus, Theodotion, Origen, Eusebius, and Apollinaris, all more or less heterodox, have supplied materials for primitive exegetics. St. Cyprian called Tertullian his master; St. Augustin refers to Ticonius; Bossuet, in modern times, complimented the labours of the Anglican Bull; the Benedictine editors of the Fathers are familiar with the labours of Fell, Ussher, Pearson, and Beveridge. Pope Benedict XIV. cites according to the occasion the works of Protestants without reserve, and the late French collection of Christian Apologists contains the writings of Locke, Burnet, Tillotson, and Paley. If, then, I come forward in any degree as borrowing the views of certain Protestant schools on the point which is to be discussed, I do so, Gentlemen, as believing, first, that the Catholic Church has ever, in the plenitude of her divine illumination, made use of whatever truth or wisdom she has found in their teaching or their measures; and next, that in particular places or times her children are likely to profit from external suggestions or lessons, which have not been provided for them by herself. 3.