impeccability and infallibility

Often discussions of the papacy confuse impeccability with infallibility. But when the Church teaches that according to Christ’s promise she has been preserved from error in matters of faith and morals, she does not also claim that either her children or her pastors are free from sin. In fact, she expressly and explicitly denies it. Cardinal Newman writes in his Lectures on the Present Position of Catholics:

I allow there are true charges which can be brought against us; certainly, not only do I not deny it, but I hardly could deny it without heresy. I say distinctly, did I take upon me to deny everything which could be said against us, I should be proving too much, I should startle the Catholic theologian as well as Protestants; for what would it be but implying that the Church contains none within her pale but the just and holy? This was the heresy of the Novatians and Donatists of old time; it was the heresy of our Lollards, and others, such as Luther, who maintained that bad men are not members of the Church, that none but the predestinate are her members. But this no Catholic asserts, every Catholic denies. Every Catholic has ever denied it, back to the very time of the Apostles and their Divine Master; and He and they deny it. Christ denies it, St. Paul denies it, the Catholic Church denies it; our Lord expressly said that the Church was to be like a net, which gathered of every kind, not only of the good, but of the bad too. Such was His Church; it does not prove then that we are not His Church, because we are like His Church; rather our being like the Primitive Christian body, is a reason for concluding that we are one with it. We cannot make His Church better than He made her; we must be content with her as He made her, or not pretend to follow Him. He said, "Many are called, few are chosen;" men come into the Church, and then they fall. They are not indeed sinning at the very time when they are brought into His family, at the time they are new born; but as children grow up, and converts live on, the time too frequently comes, when they fall under the power of one kind of temptation or other, and fall from grace, either for a while or for good. Thus, not indeed by the divine wish and intention, but by the divine permission, and man's perverseness, there is a vast load of moral evil existing in the Church; an enemy has sown weeds there, and those weeds remain among the wheat till the harvest. And this evil in the Church is not found only in the laity, but among the clergy too; there have been bad priests, bad bishops, bad monks, bad nuns, and bad Popes. If this, then, is the charge made against us, that we do not all live up to our calling, but that there are Catholics, lay and clerical, who may be proved to be worldly, revengeful, licentious, slothful, cruel, nay, may be unbelievers, we grant it at once. We not only grant it but we zealously maintain it. "In a great house," says St. Paul, "there are not only vessels of gold and silver, but also of wood and of earth; and some indeed unto honour, but some unto dishonour." There are, alas, plenty of children of the Church, who by their bad lives insult and disgrace their Mother.

From Ott's Fundamentals of Catholic Dogma:

The ontological basis of the communication of idioms is the community and mutual communication of the Divine and human properties and activities in Christ. This derives from the unity of the Person in such fashion that the human properties are predicated of the Word and the Divine properties of the Man-Christ. The communicatio idiomatum in the logical sense (predication of idioms) obviously derives from the ontological reality.

Christ's Divine and Human characteristics and activities are to be predicated of the one Word Incarnate. (De fide)

And later, about the "Rules Concerning the Predication of Idioms":

The nature of the Hypostatic Union is such that while on the one hand things pertaining to both the Divine and the human nature can be attributed to the person of Christ, on the other hand things specifically belonging to one nature cannot be predicated of the other nature. Since concrete terms (God, Son of God, Man, Son of Man, Christ the Almighty) designate the Hypostasis and abstract terms (Godhead, humanity, omnipotence) the nature, the following rule may be laid down: communicatio idiomatum fit in concreto, non in abstracto. The communication of idioms is valid for concrete terms not for abstract ones. So, for example: The Son of Man died on the Cross; Jesus created the world. The rule is not valid if there be reduplication, [and if] by reduplication the concrete term is limited to one nature. Thus it is false to say "Christ has suffered as God," "Christ created the world as a human being." It must also be observed that the essential parts of the human nature, body and soul, are referred to the nature, whose parts they are. Thus it is false to say: "Christ's soul is omniscient," "Christ's body is ubiquitous."

Further, predication of idioms is valid in positive statements not in negative ones, as nothing may be denied to Christ which belongs to Him according to either nature. One, therefore, may not say: "The Son of God has not suffered," "Jesus is not Almighty." Assertions liable to be misunderstood should be protected by clarifying additions like "as God," "as man," for example, "Christ, as man, is a creature."

Interesting stuff, in my opinion.

the development of an idea

When an idea, whether real or not, is of a nature to arrest and possess the mind, it may be said to have life, that is, to live in the mind which is its recipient. Thus mathematical ideas, real as they are, can hardly properly be called living, at least ordinarily. But, when some great enunciation, whether true or false, about human nature, or present good, or government, or duty, or religion, is carried forward into the public throng of men and draws attention, then it is not merely received passively in this or that form into many minds, but it becomes an active principle within them, leading them to an ever-new contemplation of itself, to an application of it in various directions, and a propagation of it on every side. Such is the doctrine of the divine right of kings, or of the rights of man, or of the anti-social bearings of a priesthood, or utilitarianism, or free trade, or the duty of benevolent enterprises, or the philosophy of Zeno or Epicurus, doctrines which are of a nature to attract and influence, and have so far a primâ facie reality, that they may be looked at on many sides and strike various minds very variously. Let one such idea get possession of the popular mind, or the mind of any portion of the community, and it is not difficult to understand what will be the result. At first men will not fully realise what it is that moves them, and will express and explain themselves inadequately. There will be a general agitation of thought, and an action of mind upon mind. There will be a time of confusion, when conceptions and misconceptions are in conflict, and it is uncertain whether anything is to come of the idea at all, or which view of it is to get the start of the others. New lights will be brought to bear upon the original statements of the doctrine put forward; judgments and aspects will accumulate. After a while some definite teaching emerges; and, as time proceeds, one view will be modified or expanded by another, and then combined with a third; till the idea to which these various aspects belong, will be to each mind separately what at first it was only to all together. It will be surveyed too in its relation to other doctrines or facts, to other natural laws or established customs, to the varying circumstances of times and places, to other religions, polities, philosophies, as the case may be. How it stands affected towards other systems, how it affects them, how far it may be made to combine with them, how far it tolerates them, when it interferes with them, will be gradually wrought out. It will be interrogated and criticized by enemies, and defended by well-wishers. The multitude of opinions formed concerning it in these respects and many others will be collected, compared, sorted, sifted, selected, rejected, gradually attached to it, separated from it, in the minds of individuals and of the community. It will, in proportion to its native vigour and subtlety, introduce itself into the framework and details of social life, changing public opinion, and strengthening or undermining the foundations of established order. Thus in time it will have grown into an ethical code, or into a system of government, or into a theology, or into a ritual, according to its capabilities: and this body of thought, thus laboriously gained, will after all be little more than the proper representative of one idea, being in substance what that idea meant from the first, its complete image as seen in a combination of diversified aspects, with the suggestions and corrections of many minds, and the illustration of many experiences. (John Henry Newman, Development of Doctrine, 36-38)

Christian doctrine

What the church of Jesus Christ believes, teaches, and confesses on the basis of the word of God: this is Christian doctrine. Doctrine is not the only, not even the primary, activity of the church. The church worships God and serves mankind, it works for the transformation of this world and awaits the consummation of its hope in the next. "Faith, hope, love abide, these three; but the greatest of these is love" -- love, not faith, and certainly not doctrine. The church is always more than a school; not even the Enlightenment managed to restrict or reduce it to its teaching function. But the church cannot be less than a school. It's faith, hope and love all express themselves in teaching and confession. Liturgy is distinguished from ceremonial by a content that is declared in the Credo; polity transcends organization because of the way the church defines itself and its structure in its dogma; preaching is set apart from other rhetoric by its proclamation of the word of God; biblical exegesis avoids antiquarianism because it is intent on discovering what the text teaches, not merely what is taught. The Christian church would not be the church as we know it without Christian doctrine. (Jaroslav Pelikan The Emergence of the Catholic Tradition (100-600) [Chicago: University of Chicago Press, 1971] 1)