Council of Trent: Session XIV, Penance, Chapter VII

CHAPTER VII. On the Reservation of Cases.

Wherefore, since the nature and order of a judgment require this, that sentence be passed only on those subject (to that judicature), it has ever been firmly held in the Church of God, and this Synod ratifies it as a thing most true, that the absolution, which a priest pronounces upon one over whom he has not either an ordinary or a deligated jurisdiction, ought to be of no weight whatever. And it hath seemed to our most holy Fathers to be of great importance to the discipline of the Christian people, that certain more atrocious and more heinous crimes should be absolved, not by all priests, but only by the highest priests: whence the Sovereign Pontiffs, in virtue of the supreme power delivered to them in the universal Church, were deservedly able to reserve, for their special judgment, certain more grievous cases of crimes. Neither is it to be doubted,--seeing that all things, that are from God, are well ordered-but that this same may be lawfully done by all bishops, each in his own diocese, unto edification, however, not unto destruction, in virtue of the authority, above (that of) other inferior priests, delivered to them over their subjects, especially as regards those crimes to which the censure of excommunication is annexed. But it is consonant to the divine authority, that this reservation of cases have effect, not merely in external polity, but also in God's sight. Nevertheless, for fear lest any may perish on this account, it has always been very piously observed in the said Church of God, that there be no reservation at the point of death, and that therefore all priests may absolve all penitents whatsoever from every kind of sins and censures whatever: and as, save at that point of death, priests have no power in reserved cases, let this alone be their endeavour, to persuade penitents to repair to superior and lawful judges for the benefit of absolution.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).