Apostolici Regiminis

Apostolici Regiminis was a papal bull issued 19 December 1513, by Pope Leo X, in defence of the Roman Catholic doctrine concerning the immortality of the soul.

Others, prescinding from the teaching of revelation, held that doctrine to be true according to natural reason and philosophy.

He refers to the definition of the Council of Vienne (1311) published by Pope Clement V (1305–14) which taught that the soul is "really, of itself, and essentially, the form of the body";[1] and then declares that it is of its own nature immortal, and that each body has a soul of its own.

Moreover, if the condemned doctrine were true, the Incarnation would have been useless, and we should not need the Resurrection; and those who are the most holy would be the most wretched of all.

The Bull enjoins on all professors of philosophy in universities to expound for their pupils the true doctrine and refute the false one.