“The Light of Orthodoxy”
Pope Leo XIII. Aeterni Patris of 1879: Among the Scholastic Doctors, the chief and master of all towers Thomas Aquinas, who, as Cajetan observes, because "he most venerated the ancient doctors of the Church, in a certain way seems to have inherited the intellect of all."(34) The doctrines of those illustrious men, like the scattered members of a body, Thomas collected together and cemented, distributed in wonderful order, and so increased with important additions that he is rightly and deservedly esteemed the special bulwark and glory of the Catholic faith. With his spirit at once humble and swift, his memory ready and tenacious, his life spotless throughout, a lover of truth for its own sake, richly endowed with human and divine science, like the sun he heated the world with the warmth of his virtues and filled it with the splendor of his teaching. Philosophy has no part which he did not touch finely at once and thoroughly; on the laws of reasoning, on God and incorporeal substances, on man and other sensible things, on human actions and their principles, he reasoned in such a manner that in him there is wanting neither a full array of questions, nor an apt disposal of the various parts, nor the best method of proceeding, nor soundness of principles or strength of argument, nor clearness and elegance of style, nor a facility for explaining what is abstruse.
Pope Pius XI. Studiorum Ducem 1923: That humility was the foundation upon which the other virtues of Thomas were based is clear to anyone who considers how submissively he obeyed a lay brother in the course of their communal life; and it is no less patent to anyone reading his writings which manifest such respect for the Fathers of the Church that "because he had the utmost reverence for the doctors of antiquity, he seems to have inherited in a way the intellect of all" (Leo XIII, ex Card. Caietano, litt. Encycl. Aeterni Patris, 4th August, 1879); but the most magnificent illustration of it is to be found in the fact that he devoted the faculties of his divine intellect not in the least to gain glory for himself, but to the advancement of truth. Most philosophers as a rule are eager to establish their own reputations, but Thomas strove to efface himself completely in the teaching of his philosophy so that the light of heavenly truth might shine with its own effulgence.