Thomas,(129) Catholic apologists, while maintaining the necessity of a supernatural revelation even with regard to the truths of natural religion and ethics, base their argument not on the alleged physical incapacity of reason to ascertain these truths, but on the moral impossibility (_i.e._ insuperable difficulty) of finding them unaided. “It is to be ascribed to this divine Revelation,” says the Vatican Council, “that such truths among things divine as are not of themselves beyond human reason, can, even in the present state of mankind, be known by every one with facility and firm assurance, and without admixture of error.”(130) In conformity with the teaching of Revelation and Tradition, the Church has always sharply distinguished between πίστις and γνῶσις,—faith and knowledge, revelation and philosophy,—assigning to reason the double rôle of an indispensable forerunner and a docile handmaid of faith. Far from antagonizing reason, as charged by her enemies, the Church has on the contrary always valiantly championed its rights against Scepticism, Positivism, Criticism, Traditionalism, Rationalism, Pantheism, and Modernism.(131) 2. As regards those purely natural truths that constitute the domain of science and art, Catholic divines are practically unanimous(132) in holding that, though man possesses the physical ability of knowing every single one of these truths, even the most highly gifted cannot master them all. Cardinal Mezzofanti had acquired a knowledge of many languages,(133) and undoubtedly was capable of learning many more; yet without a special grace he could not have learned all the languages spoken on earth, though their number is by no means infinite. The science of mathematics, which embraces but a limited field of knowledge, comprises an indefinite number of propositions and problems which even the greatest genius can not master. Add to these impediments the shortness of human life, the limitations of the intellect, the multitude and intricacy of scientific methods, the inaccessibility of many objects which are in themselves knowable, (_e.g._ the interior of the earth, the stellar universe)—and you have a host of limitations which make it physically impossible for the mind of man to encompass the realm of natural truths.(134) *Thesis II: Fallen man, whether pagan or sinner, is able to perform some naturally good works without the aid of grace.* This thesis may be technically qualified as _propositio certa_.