"No one can be justified without this faith, nor shall any one, unless he persevere therein to the end, attain everlasting life. Hence God, through his only-begotten Son, has established the Church as the guardian and teacher of his revealed word. For only to the Catholic Church do all those signs belong which make evident the credibility of the Christian faith. Nay, more, the very Church herself, in view of her wonderful propagation, her eminent holiness, her exhaustless fruitfulness in all that is good, her Catholic unity, her unshaken stability, offers a great and evident claim to belief, and an undeniable proof of her divine mission. Thus the Church shows to her children that the faith they hold rests on a most solid foundation. Wherefore, totally unlike is the condition of those who, by the heavenly gift of faith, have embraced the Catholic truth, and of those who, led by human opinions, are following, a false religion." "OF FAITH AND REASON.--Moreover, the Catholic Church has ever held and now holds that there exists a twofold order of knowledge, each of which is distinct from the other, both as to its principle and its object. As to its principle, because in the one we know by natural reason, in the other by divine faith; as to the object, because, besides those things which our natural reason can attain, there are proposed to our belief mysteries hidden in God, which, unless by him revealed, cannot come to our knowledge. "Reason, indeed, enlightened by faith, and seeking, with diligence and godly sobriety, may, by God's gift, come to some understanding, limited in degree, but most wholesome in its effects, of mysteries, both from the analogy of things which are naturally known and from the connection of the mysteries themselves with one another and with man's last end. But never can reason be rendered capable of thoroughly understanding mysteries as it does those truths which form its proper object. For God's mysteries, in their very nature, so far surpass the reach of created intellect, that, even when taught by revelation and received by faith, they remain covered by faith itself, as by a veil, and shrouded, as it were, in darkness as long as in this mortal life.