There is no need to exhort them to true and holy unity, since through the divine goodness they already possess it; nevertheless, they must be admonished, lest under pressure of the growing perils on all sides around them, through negligence or indolence they should lose this great blessing of God. For this purpose, let them take this rule of thought and action, as the occasion may require, from those instructions which at other times We have addressed to Catholic peoples, either collectively or individually; and above all, let them lay down for themselves as a supreme law, to yield obedience in all things to the teaching and authority of the Church, in no narrow or mistrustful spirit, but with their whole soul and promptitude of will.
On this account let them consider how injurious to Christian unity is that error, which in various forms of opinion has ofttimes obscured, nay, even destroyed the true character and idea of the Church. For by the will and ordinance of God, its Founder, it is a society perfect in its kind, whose office and mission it is to school mankind in the precepts and teachings of the Gospel, and by safeguarding the integrity of moral and the exercise of Christian virtue, to lead men to that happiness which is held out to every one in heaven. And since it is, as we have said, a perfect society, therefore it is endowed with a living power and efficacy which is not derived from any external source, but in virtue of the ordinance of God and its own constitution, inherent in its very nature; for the same reason it has an inborn power of making laws, and justice requires that in its exercise it should be dependent on no one; it must likewise have freedom in other matters appertaining to its rights.
But this freedom is not of a kind to occasion rivalry or envy, for the Church does not covet power, nor is she urged on by any selfish desire; but this one thing she does wish, this only does she seek, to preserve amongst men the duties which virtue imposes, and by this means and in this way to provide for their everlasting welfare.
