Despair of the possibility of knowing higher truths is confronting us, the disease of deteriorating times and intellectually decaying nations. But just as Christianity, once in youthful vigour, went to the rescue of an old World dying of scepticism, just as the Catholic Church has ever upheld the rights of reason, especially against Protestantism, which from its beginning has torn asunder faith and knowledge: so the Catholic Church stands to this day unaffected by the doubting tendency of our times, upholding the rights of reason. It also upholds faith. But its faith has nothing to do with modern agnosticism. What Faith Is. What, then, according to Catholic doctrine, is faith and the duty to believe? Let us briefly recall to mind the _fundamental tenets_ of the _Christian religion_. It tells us that even in the Old Testament, but more especially in the New, through His Incarnate Son, God has revealed to man all those religious and moral truths which are necessary and sufficient for the attainment of his supernatural end. Some of them are truths which reason by itself could not discover; others it could discover, but only by great labour. And this divine revelation demands belief. Belief is natural to man. The child believes its parents, the judge believes the witnesses, the ruler believes his counsellors. God wished to meet man in this way, and to give him certainty in regard to the highest truths. But revelation was to be an heritage of mankind, it was to be transmitted and laid unadulterated before all generations. For this reason it could not be left unprotected to the vicissitudes of time, or the arbitrary interpretation of the individual. It would have utterly failed in its purpose of transmitting sure knowledge of certain truth,—the history of Protestantism proves this,—had it been given merely with the injunction: Receive what I have committed to your keeping, and do with it what you please. No, it had to be made secure against subjective, arbitrary choice. To this end Christ established an international organization, the _Church_, and committed to it His Gospel as a means of grace, together with the right and sacred duty to teach it to all men in His Name, to keep inviolate the heirloom of revelation, defending it against all error. “Going, therefore, teach ye all nations” (Matt. xxviii. 19), was His command. “Go ye into the whole world and preach the Gospel to every creature; he that believeth and is baptized shall be saved, but he that believeth not shall be condemned” (Mark xvi. 15). “He that heareth you, heareth Me, and he that despiseth you, despiseth Me” (Luke x. 16). “Behold, I am with you all days, even to the consummation of the world” (Matt. xxviii. 20). He gave His divine aid to the Church, in order that she might _infallibly_ keep His doctrine to the very end of time.